Monsters, Inc.

Plot hole: When Sully and Mike are talking in the toilets, during Boo and Sully's Hide and Seek game, Boo comes running in screaming and upset because she's just seen Randall, and he's not too far behind since all three can hear him talking offscreen to the CDA before entering the toilets, but how did Boo get to Sully faster than Randall without him seeing her, and how did Randall not hear her screams since they're all in the changing rooms which have an echo?

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)

More mistakes in Monsters, Inc.

Mike: I'm telling you, Big Daddy. You're gonna be seeing this face on TV more often.
Sulley: Yeah, like on "Monstropolis' Most Wanted"?
Mike: Ha, ha, ha. You've been jealous of my good looks since the fourth grade, pal.

More quotes from Monsters, Inc.
Monsters, Inc. trivia picture

Trivia: Boo's real name is Mary, the same as the young girl, Mary Gibbs, who voices Boo. This is only just visible on one of the drawings Boo makes in Mike and Sulley's apartment.

Kara

More trivia for Monsters, Inc.

Question: After Monsters, Inc. has switched over to "laugh power", the scare floor has a very different look. There's a board in the back with "JOKE OF THE DAY" written on it. Can anyone see the text of the joke?

Answer: The Doctor says to the patient, "What seems to be the problem?" The patient lifts his arm and says "It hurts when I do this." The Doctor says "don't do that."

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