Birds Anonymous (1957)

Continuity mistake: When Sylvester is unable to sleep at night, the camera pans in on his eyes and you can see that he has his head on the pillow when this happens, but in the next shot he is lying flat out on the bed.

Clarence: I wouldn't do that if I were you. If I were you, I'd put him back. It can only lead to self destruction. It only takes one bird to start you, and before you know it, it's two birds, then three. Suddenly, without realizing it, you're a victim. Then one day... the end of the road.

Trivia: Voice artist Mel Blanc said that this was his personal favourite of all the cartoons he worked on.