Revealing mistake: The laser blasts the robots fire instantly exterminate or destroy most everything in their path. However, when the guys are shooting at them during the mall blast-out, the lasers suddenly don't do much damage at all.
Chopping Mall (1986)
1 revealing mistake - chronological order
Directed by: Jim Wynorski
Starring: Kelli Maroney, Karrie Emerson, Russell Todd, Tony O'Dell
Factual error: When the first robot is trapped in the lift, the teenagers shoot the propane tanks on top of the lift in order to get them to catch fire and explode, killing the robot. However the teens are firing pistols or shotguns, and these do not contain incendiary ammunition, which is what is required to make the propane to catch fire.
Trivia: Paul Bartel and Mary Woronov play Paul and Mary Bland in this film. These are the characters they played in the film "Eating Raoul."