Continuity mistake: In the beginning, Jerry Lewis makes his special drink and it is the consistency of a milk-shake. Later in the movie he makes the same drink and it looks like cloudy water.
Continuity mistake: In scene where Professor Kelp first transforms, the bird's cage switches between being covered and uncovered. (00:31:00)
Continuity mistake: When Professor Kelp throws the formula book at Jennifer, her cage is closed. When he returns to find the formula book destroyed, the cage door is open. (01:21:50 - 01:30:20)
Continuity mistake: In the first scene with Stella and Buddy Love at the Purple Pit, Stella's eye shadow is bright blue and extends above her eyebrows. When the scene moves to the hill above the city, her eye shadow switches between nonexistent and a light green. (00:46:00 - 00:50:45)
