Putty Tat Trouble (1951)

Continuity mistake: When Sylvester is banging on the door of his apartment, there is no handle on the door. When his lady opens the door, a handle has appeared, and the door panels change.

Trivia: When Sylvester looks into the pipe to see where Tweety Pie went, you can see a portrait of director Friz Freleng behind him.