* A flashback depicts Vincent van Gogh with his right ear cut off; however, he actually cut off the left ear.
* One of the eggs that Peter and Chris threw at their house disappears as Brian opens the door without changing scenes.
* When Peter and Lois tell Chris's teacher about his crush on her, their seats change color.
* When Brian first enters the English Remedial class, the Asian kid in the orange jumper disappears before he goes completely out of the frame.