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: At the beginning of the movie the spaceship has three runabouts affixed to the bottom of the hull. The middle one is used to travel to an unknown spaceship and is blown up. Immediate subsequent shots of the outside of the spaceship show the middle runabout missing. But after a while, outside shots show all three again nestled in their bays.