Continuity mistake: When Tom finds Butch in the fridge, he leaves the fridge door open, but after Jerry takes away the ham from Butch, he runs past the fridge and the door is now closed.
Continuity mistake: When Butch opens the door to steal the ham from the fridge, the handle is initially on the right hand side of the door, but when he opens it later on the handle has moved to the left hand side.