Continuity mistake: When Jerry slams the door on the dollhouse after Tom attempted to catch him after his dress slips off, the blind in the top window is pulled right up but in the next shot it's now pulled down halfway.
Revealing mistake: When Tom is startled to hear "Rock A Bye Baby" on the phonograph, the whiskers on the left side of his face disappear for a frame or two.
Continuity mistake: When Jerry rushes back into the dollhouse after his dress slips off, he shuts the door on Tom and you can see that Jerry's dress is next to Tom, but in the next shot the dress has disappeared.
Continuity mistake: When Jerry emerges from the dollhouse wearing the doll's clothes, you can see the safety pin on Tom's diaper is pointing up, but when see Jerry strolling past him in the next shot, the pin is now lying face down.
Continuity mistake: In a close-up of the grey kitten performing "Mama Eu Quero", one of the blue beads on his necklace changes colour to yellow.