Revealing mistake: When the Leprechaun gets sucked into space, he grabs onto the edges of the cargo bay's doors. You can see pieces of his hands disappear into the doors, showing that it's CG.
Leprechaun 4: In Space (1996)
1 mistake
Directed by: Brian Trenchard-Smith
Starring: Warwick Davis, Jessica Collins, Brent Jasmer, Guy Siner
Dr. Mittenhand: I am like the Wizard of Oz, am I not? Running things from behind a curtain. Only this wizard IS NOT A FAKE.