Plot hole: When James and Gemma arrive back at the waxwork just before the film's climax, they claim a "man with a high-pitched voice" (Hans) invited them. In the earlier scene when they decided to not enter the waxwork, they left before Hans answered the door, and he couldn't have found their phone numbers anyway.
Waxwork (1988)
1 plot hole
Directed by: Anthony Hickox
Starring: Deborah Foreman, Zach Galligan, Jennifer Bassey, Joe Baker
Deliberate mistake: In the final battle at the end, Mark Loftmore enters the back room where we see Mr. Lincoln leaning over the body of an older man with a red jacket whom Lincoln has apparently just shot. This same man later appears in the background of at least one shot of the general melee taking place outside in the gallery.
Mr. Lincoln: They'll make a movie about anything nowadays.