Continuity mistake: When Tom traps Jerry in the blinds, he pulls the cord and squashes Jerry. At this point, you can see Tom is holding the cord, but when we Jerry sliding down the blinds in the next shot, Tom is no longer holding the cord.
Continuity mistake: When Mammy Two-Shoes is getting ready for her evening out, there is a purple jewellery box on her dressing room table which has a ring next to it, but when Mammy turns and leaves in the next shot, the ring has disappeared.
Continuity mistake: When the record player is playing, Jerry pulls off the tone arm and throws it away. The arm suddenly re-appears when Tom puts the music back on to disturb Jerry.