Corrected entry: When Sully and Mike leave the company bathroom, they are walking down the hall and you can see that both of Mike's legs are wet. As they keep walking down the hall, they dry far too quickly.
Corrected entry: When Sully and Mike are going to work the first time, they are carrying lunch boxes. When they leave at the end of the day they aren't carrying them anymore.
Corrected entry: When Sully gets expelled from monstropolis, he wastes no time in locating a child's room so that he can return. None of the other banished monsters thought of this? And what about the monster that was busy scaring the occupant of that room? Why didn't he stop Sully or at least raise an alarm?
Corrected entry: In the first shot of all the monsters entering the scare-floor, there is a broad-chested purple monster without eyes. In his next two shots he has three eyes. Then in the following shot his eyes are gone again until his assistant gives him a whole bunch.
Corrected entry: Just after James tells Mike nothing matters, it cuts to a scene with Mike holding the ball from a snow cone and he has only two toes on his left foot. It then goes to James again and when it goes back to Mike he has three toes again.
Corrected entry: When Sully rescues Boo from the Scream Extractor, he picks up her door card key from the floor with his left hand and is carrying Boo in his right. But when Randall attacks him, you don't see the card fly out of his hand. In fact, you don't see it anywhere. How does he happen to have it later on the scare floor?