Saturday Evening Puss (1950)

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.

Trivia: When Jerry phones the club and informs Mammy Two-Shoes about the party, she runs back home. You can see Mammy Two-Shoes' face for about two frames as she runs back to the house.