I Taw a Putty Tat (1948)

Continuity mistake: When Tweety hits Sylvester on the paw with a mallet, the background behind Sylvester changes between shots.

Trivia: When Sylvester cannot put Tweety Pie in his mouth due to him swallowing the alum, he puts Tweety back in the cupboard. When he does so, you can see a small can with "Friz" behind him - a reference to the director Friz Freleng.