Bandit is an archeologist, digging up bones for a living, and Chili works in airport security. Both parents' jobs are stealth jokes about the fact that they're dogs (since dogs are sometimes used to sniff for drugs in airport security).
Speaking of stealthy dog puns, doesn't pavlova cakes (a type of dessert in the Antipodes mentioned in several episodes) sound pretty similar to a popular experiment involving dogs and food?
Another dog pun: Chili's maiden name of Cattle references both of the breed's names: the Blue Heeler is otherwise known in North America as the Australian Cattle Dog.
Related, but Bandit's not often shown doing much work at dig sites. Actually, archaeologists don't spend all their time at dig sites - thus Bandit's easily the one who can stay at home and take care of the kids!
In "Asparagus", Chili giving Bluey the titular 'magic' asparagus was prompted because her husband pointed out she wasn't allowed to put her elbows on the table. Petty, perhaps? No, actually! You see, the "no elbows on the table" rule was invented during a bygone era when table tops weren't permanent fixtures. And if you put your elbows on the table in those days, it would flip over and spill food and plates and silverware all over. But these days, tables are more stable. So Chili wasn't being petty: she was getting back at her husband for being a persnickety stickler for an outdated rule.
Another reason is that Bluey specifically asked her mom why manners are important to which Chili was visibly ready to answer, only for Bandit to butt in, which is not only insulting - Bandit assuming his wife wouldn't give a satisfactory answer - but itself is very rude, as Bandit butts in to answer a question not meant for him, speaks for Chili and interrupts her, all while preaching the virtues of manners. This was also a lesson on hypocrisy.
Coco's tendency to bend the rules in "Shadowlands" isn't just a flaw that comes out of nowhere. In "Baby Race", it's revealed that her mother Bella has had eight other children before her. With all those older siblings, it wouldn't be a surprise that playing with them would make it hard to win on fair grounds. It takes Bluey's game to help Coco realize that fair play and winning aren't exclusive.
Bandit cheating during the running race by dragging Bluey off to the side before she was supposed to win in "Obstacle Course" is quite a low blow, but there's a reason (not an excuse) for what he did. "Fairytale" shows that when Bandit was 10, he was jinxed by his brother Rad, and gave chase after him, and lost it as part of being jinxed is failing to touch the jinxer before the count of 10. Nearly losing to Bluey could've unwittingly triggered the bad memory of being jinxed when Bandit failed to catch Rad.
Throughout "Camping", Bluey can't understand Jean-Luc's French, but Jean-Luc understands Bluey's English. Jean-Luc is from Canada, a country with both English and French as its official languages, so he would naturally have absorbed at least a little bit of English, even if it's not enough to speak it himself. When Bluey and Jean-Luc reunite at the end after a Time Skip, Jean-Luc greets her with a "hello" in English. French-Canadians take mandatory English lessons in school, so his English would naturally get better after a few years of school.
Stripe refusing to un-jinx Bandit even after he helped him might just sound like a case of Ungrateful Bastard, but there's also another moral sneakily thrown in there: You don't do good things because it'll benefit you (breaking the curse), you do good things because it's the right thing to do.
In addition, Stripe might've not forgiven Bandit yet, especially considering all the times Bandit was mean to him compared to the one time he was nice.
Socks' appearances are quite sparse throughout season 2. Considering 'Christmas Swim' shows her walking on two legs and talking more (as an indicator of her being a little older), it's possible that this was an intentional choice on the writers' part, so her growth wouldn't seem quite so jarring and out-of-nowhere.
In 'Sticky Gecko,' we learn that Wendy made the Heelers five lasagnas when Bluey was born. Even without considering the fact that she would have either been heavily pregnant or having just given birth herself around the time, lasagnas are known for being labor intensive to make; even one would have been a big deal.
At first it seems odd in "The Sleepover" how Muffin is able to run around and yell a lot despite being tired. However, sometimes when a person is tired (especially children Muffin's age), they can create an excess of a hormone meant to fight fatigue, making them seem energetic when they're really not.
As pointed out on this video, Bandit's "raiders" game from "Yoga Ball" is a Shout-Out to Raiders of the Lost Ark, and there are two reasons why Bandit would base a game on that movie in-universe: 1.) It came out in The '80s, and "Fairy Tale" reveals that he grew up in the 80's, and 2.) He's an archaeologist, which means the movie probably resonates with him.
Muffin's mother removes her cone, which is there to stop a bad habit (thumb sucking), when Trix herself realizes she's unable to curb her own habits (snacking in her case). More than the Parental Hypocrisy at play, many bad habits (both addictions and more minor bad habits) are hereditary; Trix might feel that Muffin gets it from her.
In a few episodes characters pick up food that's dropped on the floor/ground and eat it. Well, they aredogs.
In "Space", Mackenzie pretends to explore outer space, but ends up exploring his own mind - innerspace.
"Circus" has a low-key example of Jerkass Has a Point when Hercules is adamant about everyone being the motorbike jump. On paper, it wouldn't hurt to let Winton be the biker. But then, oh wait, one realizes it would be problematic. Because Hercules is too big to be jumped over, especially by Winton. While it doesn't excuse his rather abusive treatment towards the other children, it does put his approach to the motorbike game in a more pragmatic light.
Coco seems to have gone from one extreme to the other with regards to playing games. In "Shadowlands," she keeps ignoring/changing the rules of the game, but Bluey tells her that rules make games fun. Later on, in "Wild Girls," Coco appears to have followed Bluey's words to the letter, as she is adamant on not changing anything in the game. But no matter how you look at it, Coco always likes to get her own way.
Calypso appearing out of nowhere when Coco is crying in "Wild Girls" makes sense when you remember that she's a Blue Merle Australian Shepherd, a herding dog. This means she must have good instincts for her students.
As pointed out here, a few viewers saw Bandit getting embarrassed to pretend to be a whale in front of another father in "Pirates" as an Out-of-Character Moment, since he's acted silly in front of other adult dogs before. However, usually when he acts silly in front of another adult dog, it's either his friend and/or neighbour (such as Pat or Wendy), or he's doing it to make up for hurting someone's feelings (like with Bingo in "Dance Mode" and "Fairies"). There also have been other times when he has indeed been embarrassed to act silly in front of a stranger, such as in "Wagon Ride".
In "The Show", Bandit says, "Well, you wouldn't" when Chilli says she doesn't remember the Queen being at the party. While this could just be a Demographically Inappropriate Humour joke about drunkenness, considering "Fairy Tale", it could mean something else — Bandit thinks the girl he met when he was ten was Chilli, but she has no recollection of it. So Bandit might be teasing Chilli and saying that if she can't remember meeting him as a kid, then it's typical that she'd also forget about the Queen.
In "Fruit Bat" and "Mum School", Bluey's parents comment on her smelling bad when she needs a shower/bath, despite her being too young to have body odour. She's a dog, and if dogs go unwashed, they can start to smell bad due to buildup of dander.
Hercules' Heel–Face Turn in "Circus" happened because he saw Mackenzie (as the "mean lion tamer") treating Honey (the "lion") much the same way he had been treating Winton and the others. Hercules realized he was doing the wrong thing once he saw it from the outside, and made amends for it.
In "Butterflies," Judo seems pretty fixated on Bluey ("Bluey's my friend") to the point that she tries to exclude Bingo from their playtime. But Judo's a chow, and in real life, chows tend to get attached to a single person.
Bandit probably became an archeologist because of Indiana Jones. He regularly plays a game based on the first film called "Raiders", as seen in 'Yoga Ball', and reenacts the "No ticket!" scene in 'Perfect', plus he was growing up in the Eighties when the films first came out.
At the end of 'The Adventure', Chloe "freezes" her dad while he's driving. Hopefully, he was able to pull over (or stopped playing soon)...
In 'Grandad', we're told that Grandad needs to rest because he is recovering from heartworm, which is an absolutely horrifying disease in its own right. And while it's also ridiculously preventable with pills, spot-on topical treatments, or annual injections, the dead parasites can stay in a dog's heart for some time afterwards, with any intense activity running the risk of making the heart beat fast enough that they travel through the bloodstream and right into the lungs, killing the dog by keeping them from breathing. Even if this doesn't happen, heartworms cause damage to the heart, lungs, and liver simply by virtue of being foot long worms that plug up the heart and surrounding vessels, something that's especially concerning in an older dog. In short, Chilli has every right to be worried about her father pushing himself too hard.
In "Easter", Bluey and Bingo go on a hunt for chocolate Easter eggs — which sounds cute and fun, until you remember that they're dogs.
Mitigated by the fact that dogs in this universe seem to have no problem eating chocolate as seen by episodes like "Ice Cream". And they're shown to be eating other foods that aren't good for dogs, so they'll be fine.
"Army" as a whole implies that, even though it's the colorful, kid-friendly world of Bluey, there are still wars and armed conflicts. Judging by how Rusty plays army, too, without even mentioning any imaginary weapons and running away from conflict, he doesn't understand yet that the army involves killing people. That has to be an awkward explanation for any military kid to get.
Chilli clutching Bandit's hand when the balloon baby pops during "The Show" is put in a new light after "Onesies". It might have reminded Chilli of her sister's struggles with not being able to have children.
Another prevailing theory is that Chilli may have had a miscarriage some time before having Bluey.note And indeed, this was partially confirmed by Joe Brumm in the book Hard to Bear: Investigating the Science and Silence of Miscarriage, by Isabelle Oderberg (the only part that remained unconfirmed was the "before Bluey" part).
Another way of reading that scene, in light of Baby Race, is that Chili's pregnancy or labor with Bluey might've been a difficult one.
Others have picked up on one other "hint" that there was a miscarriage before Bluey... in "Planets", Bluey plays the role of Venus. Bingo plays the role of Earth. There's one planet missing...
Granddad Heeler is shown in "Grannies", but besides from flashbacks in "Fairytale", he's never seen again, despite Nana Heeler making several appearances. Most fans believe that he was Killed Offscreen. And the implication that Chilli's mother is also dead, as hinted at in "Dragon", adds a new layer of sadness to this theory, and to Chilli's worry for Granddad Heeler's health in "Grandad".
The implication of Chili's mother's death also adds a layer of sadness to her talk with Bluey in "Camping" about how sometimes people don't stay in your life, but you can be happy for the times they were there, as well as to "Onesies", where Chili was practicing the dance she made up with Brandy for their mother's birthday. Being estranged from Brandy was already sad for Chili, but knowing their mother is gone makes the estrangement even sadder.
During their storytime of "The Dragon-punching Prince" in "Double Babysitter", the princess (Frisky) accuses the prince (Rad) will probably just go looking for other princesses when he gets the chance. This implies that her break-up with Bosco wasn't simply a matter of not working out: Bosco possibly cheated on her. Given she once called him her "one true love", it's sobering that her feelings for Bosco were one-sided, as he possibly didn't value her as much as she did him. It could have also been that he left her for another female dog, but still, adultery is a possibility.
Word of God confirmed that Chilli had a miscarriage, and Brandy almost explicitly can't have kids. Seeing as they're sisters, this might imply they have a genetic condition... and Bluey and Bingo are both the daughters of Chilli. This means that either or both of them might go on to be infertile or have miscarriages when they grow up.
The budgie dying in "Copycat" after an injury (possibly from a cat) is already sad, but it becomes sadder at the realisation that all wild budgies are green and yellow. Since this budgie was blue, that means it was a pet.
As pointed out here, Brandy's angst at not being able to have kids becomes even worse when one considers that not only does Chilli have children when Brandy can't, Chilli has two girls, just like Brandy and Chilli. This probably added to her grief.
video, Bandit's "raiders" game from "Yoga Ball" is a Shout-Out to Raiders of the Lost Ark, and there are two reasons why Bandit would base a game on that movie in-universe: 1.) It came out in The '80s, and "Fairy Tale" reveals that he grew up in the 80's, and 2.) He's an archaeologist, which means the movie probably resonates with him.