How It All Began

Party Hat and Boombox sitting together on the grass at the beginning. True friendship was shown there...
Shelly, Boat, and Popsicley compete in a board game together.
Party Hat, Shieldy, Hot Dog, and Pizza all go in the car together.
In The Stinger, Pizza comforts Hot Dog when he breaks down crying over his damaged car.

B.O.T.O.: The Videogame

Pizza warning Pear about enemies, despite being on the opposite team. Keep in mind Pear wasn't too nice to him before.
Shieldy saving Princess Diamond.

Shelly, Popsicley, Boat, and Chocolatey having their own friendship group together.
The contestants going into the mall together.
Popsicley allowing Boat to listen to Jazz.
Slurpy, Shelly, and Party Hat working together to get Party Hat a cute, little Teddy Bear from a toy store. Party Hat eventually gets it and is happy.

The objects being allowed to duet. Even if they are on different teams!
The Better Tomorrow Song.
Shelly and Hot Dog: ♫ It will be better tomorrow. Believe me, it will be better tomorrow! ♫

The penguin starts falling in love with the droid, along with an adorable pink background.

Shieldy giving Big Orange Chicken some birdseed just to make him happy and be friends with him. Aww!
Party Hat being concerned about his teammates' sudden disappearances.
Shelly prioritizing finding Shieldy rather than winning.
Team Vanilla's Team Spirit and finally winning after two losses.

Party Hat saying he wants to get to know Baguette better if there wasn't a language barrier.
Baguette saving Party Hat from arrows being shot out by a booby trap.
Pizza reassuring Shelly there is no such thing as monsters and warning her to look out for bats, bugs, and other nocturnal creatures.
- There is also the little moment where they look at the map together. It is surprisingly cute.
Even though Pink and Purple were terrible little twins, the contestants show horror and sympathy when they are beat up by the stone monsters.

Scissors having sympathy for Prince Emerald. It's especially heartwarming when you consider how she acted at the beginning of the series.
Shieldy wins! When the prize is stolen however, Controlly makes the prize a pizza party instead. What does Shieldy do? Invites everyone to the party! The end credits show the contestants eating and having fun.
Everyone staring in horror when Shelly suffers from a brain implosion and dies. It goes to show that everyone cares for Shelly. Luckily, Shelly is recovered and everyone expresses relief.