The Chump Champ (1950)

Continuity mistake: When Spike is disguised as a fortune teller, he writes on a piece of paper: "To the Judge - I cheated in every event. Signed: Droopy". When he hands the piece of paper to the judge, the "To the Judge" and "Signed" with the dotted line are missing.

Continuity mistake: When we see a wide view of the stadium at the beginning of the cartoon, you can see there is nothing on the curtain where the judges' stand is. But when the camera pans in on the judge, there are now banners on the curtain.

Continuity mistake: When the judge is introducing Spike and Droopy, there is a piece of paper in his right hand that keeps disappearing and re-appearing between shots.