Chuckie seeing Coco as a princess may come off as manipulation from Coco and naive thinking from Chuckie but it actually makes a lot of sense both metaphorically and more literally. Coco is the head of the park and is planning to be the head president of the industry when the formal president steps down. This is very similar to a princess who tries to gain the trust and affection of her king so she can be queen some day.
This makes Chuckie's wish to have a princess for a mother is a sort of him wishing for Coco to be his mother and him learning to Be Careful What You Wish For.
"I want [Stu Pickles] here within 24 hours, or another head willroll..." Grim as it is, that line is pretty clever, not just because LeBouche is talking about the giant Reptar head that popped off the robot. It's clever because this takes place in France, a reference to the French Revolution and the guillotine.
Coco wanted Chuckie's Wa-Wa burnt while Kira preserved it. On the surface, it seems to rightly establish who would make a Wicked Stepmother and who would make a Good Stepmother. But it takes a whole new level when one realizes Wa-Wa was a gift from Chuckie's late mother, and therefore represents her memory. Coco wanting it burnt seems to represent that, shrew that she is, she would've eradicated all memory of Chaz's first wife if it means she gets control of his life. Whereas Kira cradling the bear in her arms represents she empathizes with how important Chuckie's late mother was to his family. This makes Coco all the more despicable, and further enforces Kira is the right woman for Chaz.
The plot of Reptar on Ice is very similar to the legend that Kira and Kimi tell the cast and can be collectively summed up as "a giant monster appears and goes on rampage, everyone panics, a woman realizes that the monster is not malevolent and befriends the creature" it can be argued that the plot from the ice show and possibly the first American Reptar movie was an modernized/Americanized retelling of the original tale.
Considering the episode 'Trading Places' from All Grown Up, if one watches that episode and goes back to watch this movie, they might realize that Kira has recently gone through a divorce or is currently going through a divorce, which might be one of the reasons why she's working for Coco. Well...that and she’s raising an almost two-year-old by herself.
This does add a whole new layer of Everybody Has Standards when she tells Coco she's had enough of enabling her "Marry someone for personal gain" plan. She can easily see that Coco will only serve to make Chaz and Chuckie miserable, even if it means keeping up the charade of being "some child's tender mother". Being a divorcee herself, she doesn't want Chaz to walk right into a marriage she knows will clearly ruin Chaz's family.
Unto itself, why did Kira go along with Coco's devious scheme in the first place? Why choose until the wedding day to oppose this marriage? Because up until then, she possibly thought Coco wanted to turn over a new leaf and be an actual parent. She hadn't done anything particularly unmotherly. But at witnessing her cruel behavior (which includes having children essentially locked in a warehouse) is what convinces Kira that helping Coco was a mistake.
And even then, when Kira was giving Coco advice on what to do with the babies on a date with Chaz, she could optimistically have thought that Coco sincerely wanted to bond with the children and understandably wasn't used to it. Coco even offered to take Kira's daughter on a day trip, so from Kira's perspective, it may have looked like Coco was trying in her own way. The audience of course knew her motives immediately.
Tommy and Kimi get along immediately, with Chuckie even calling them similar; they have similar personalities, as pointed out, so it's clear they'd get along. The fact that Kimi is similar to Tommy who’s Chuckie’s best friend also makes it easy to view how appropriate it is that Kimi becomes Chuckie’s stepsister later on too.
Chuckie's first word is "no", which, based on his personality, is good for a lot of situations.
It can be assumed that, despite being Japanese, English is Kimi's first language; not only does she know how to speak it as a baby, but, in All Grown Up, she doesn't know Much about her Japanese heritage.
It's even been proven that speaking to a young child in different languages (especially if both parents are bilingual) will help them learn both from an early age. Given Kimi's upper middle class background, it's entirely possible her parents wanted her to know English from a young age.
Based on what's said above, it's likely that Kimi's biological parents divorced either when she was too little to understand what was going on, or before her birth, for whatever reason.
It's shown though in All Grown Up, Kimi does speak to her biological father and sees him sometimes so he does try to stay involved with her. Especially considering in Japanese culture, exes typically don't see or speak to each other after breaking up even if they have children.
The Ooey Gooey World ride was obviously a parody of the It's A Small World rides. But it's also kinda funny when you think about it, what's Ooey Gooey World made of? Green slime! And what's Nickelodeon known for? (Hint, think about the KCA's and other in between the show segments on the channel) Also green slime! Nickelodeon incorporated green slime into one of their animated movies!
Also about Euro Reptarland and its jabs at the Disney Theme Parks: the park's entire Japan-inspired aesthetic, and Chas' Lampshade Hanging on it, could be seen as a cheeky reference to EPCOT's World Showcase, which features sections inspired by several different countries, including both Japan and France.
Overall, Chaz comes off as way more optimistic and impulsive in this film, almost channelling Stu's Manchild habits at times, a far cry from his usual cautious Nervous Wreck self. With that said the previous few episodes leading up to this had Chaz bonding with Chuckie and coming to terms with his wife's death. Combined with the fact Chaz had thought he had found true love again, it would make sense he would be on the mend and opening up a little more here.
And this continues into the main series, as Chaz eventually develops the courage to quit being a beauracrat and open his own business in the Java Lava. Character Development indeed.
Not to mention, going to Lou's wedding, being grilled by Betty about dating, and seeing how sad Chuckie was about being left out of the mother-child dance, likely triggered some feelings of inadequacy on Chaz's part that he had to overcompensate for.
Kira matches the princess Chuckie wanted as a mom; Same color scheme, same culture, and etc. The movie foreshadowed who would be truly Chuckie's new mother.
When Mr. Yamaguchi tells Coco that he wants his successor to “have the heart of a child”, she whispers to herself “I must have one in a jar somewhere”. What could be interpreted simply as her quietly stating her dislike of children, the fact that she would have the image of a literal child’s heart come to mind heavily implies she’s had kids killed before and believed that she actually does have the heart of a child in a jar somewhere.
Because Angelica is still fairly young and therefore still doesn't completely understand metaphors?
Unto itself, it takes a while to recognize the significance of the scene where Coco has a tug-of-war with Chuckie's Wawa and then furiously orders Jean-Claude to lock them in the warehouse. It's not just about this being the lead-in to the babies' lowest point. This is establishing to the audience that if Coco ever marries Chaz, she won't just change Chuckie and Chaz's lives for the worse, but also the babies. Heaven forbid if she had been successful marrying off Chaz, the babies' peaceful and idyllic adventures would cease to be. One can only wonder if having Jean-Claude lock them away whenever they inconvenienced her would've been a daily occurrence.
