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: 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 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?
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: 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: In the scene when Mike, Sully, and Boo were all hiding from Randall in the bathroom, all three of them are standing on the toilet in the same stall. They look straight ahead and see Randall using the sink in front of a mirror. But, a minute later Randall is busting open the door to each stall. When he hits their stall door open, he is looking the other way, and doesn't see them. Yet he would have seen their reflection in the mirror. I realize that Randall's eyes were not looking straight ahead into the mirror. But, where he was looking, he would have easily seen a huge, bright blue and green monster. (00:40:10)
Corrected entry: On the scare floor at the beginning of the movie, there is a monster who starts wailing about a kid almost touching him. The door shredder is then called because they have a "dead door" when it goes through the shredder two pairs of handles come out. Doors only have one handle on each side, so only one pair of handles should have come out.