Monsters, Inc. (2001)

Deliberate mistake: When Boo laughs repeatedly while playing hide-n-seek with Sully in the men's room, nothing happens to the electricity - no surges as with all other times she laughs. [In the audio commentary by the directors, they explained that it would've been distracting if an energy surge occurred every time Boo laughed, so they simply didn't address the issue. A reasonable course of action, but still a mistake.] (00:37:30)

Henry J. Waternoose: There's nothing more toxic or deadly than a human child. A single touch could kill you. Leave a door open, and one can walk right into this factory; right into the monster world.
Trainee: I won't go into a kid's room. You can't make me.
Henry J. Waternoose: You're going in there, because we need this. Our city is counting on you to collect those screams. Without scream, we have no power. Yes, it's dangerous work, and that's why I need you to be at your best. I need scarers who are confident, tenacious, tough, intimidating. I need scarers like... like... James P. Sullivan.

Trivia: The voice behind Roz, the number 1 of the Child Detection Agency and the undercover secretary, is actually a man.

Question: At the end of the movie, Fungus is seen amongst the employees promoting doing fun stuff, but since he is seen assisting Randall, and generally helping him and Waternoose with the scream machine earlier on, shouldn't he have been banished (like Randall) or hauled off by the CDA (like Waternoose) when the whole plan came to the CDA's attention?