Continuity mistake: When Rebecca makes her boyfriend strip, you can see the gun's laser on his hand before she comes around a corner and points the gun at him.
Continuity mistake: When Lori is shoved down the pipe, check out the close-ups as she slides down. At least twice she has one blue eye and one green eye - though her eyes are blue in every other scene.
Continuity mistake: The Tank alternates between having a silver machine gun to not having one, to having an Uzi 9mm, to having a 40 caliber.
Continuity mistake: Lori had two stolen tanks to convert - a Russian T-55 and a PT-76. The outcome of this conversion is a M3 Stuart with a turret from something bigger - Sherman Firefly or M60. Better than McGyver.