Continuity mistake: When the three kittens see Jerry in the drawer, behind Jerry on the table there is a book stand and at the end there are two yellow books. In the next shot, one of the yellow books has changed colour to blue, and in the shot after that, there are two yellow books again.
Continuity mistake: There are three kittens delivered to the house, one brown, one black and one orange. When Jerry is spanking the kittens on the clothes line at the very end, there are two orange cats on the line.
Continuity mistake: When the orange kitten and the brown kitten attend to Tom after they knocked him out by hitting his head on the ceiling, the eyebrow over the orange kitten's right eye disappears for a few seconds.