Continuity mistake: The scene where Bender and Vernon are in the closet, Vernon tells John to take a swing at him and points to his chin. Now in the frontal view he is pointing to his chin with his right hand, but from the back view it shows him pointing with his left hand, then it goes back to the front with him pointing with his right.
Continuity mistake: After the whistling scene, Bender is holding a pencil. When Andrew is talking you can see Bender in the background playing with the pencil. The camera cuts back and forth between him and Bender throughout the scene. But when the camera zooms in on Bender when he's talking, he has nothing in his hands.