peter pan:
peter pan was an angel who held kids' hands on their way to heaven (neverland). that's why they never grow up; they passed away.
there's a theory though that peter pan is actually a serial killer who kills children and takes them to neverland. or something like that.
aladdin:
aladdin wasn't real. in the beginning of the movie, the guy was telling a story about aladdin so he can sell a lamp, it's all made up by kids, there are no flying carpets.
finding nemo:
nemo means "no one." in latin. "finding nemo," means "finding no one," so the whole movie is about a delusional father by the name of marlin, who was so traumatized looking for his lost family, he went looking for his dead son.
snow white:
snow white is actually a known metaphor for cocaine, and the seven dwarfs are all side effects of the drug.
caillou:
caillou is a kid who has cancer, thus a bald head. his parents are trying to make his last few years memorable.
