Continuity mistake: Throughout the scene when Dane, Lucas and Julie meet Creepy Carl for the first time, Carl is wearing a red diamond-shaped pendant on a chain around his neck, which is sometimes tucked under his shirt and sometimes hanging over it, depending on the shot. (00:44:26)
Continuity mistake: When Susan accidentally surprises Dane, Lucas and Julie while they are armoured up and asleep in the basement, the helmets worn by Lucas and Julie disappear between shots. (00:36:47)