Continuity mistake: In the deer scene the deer breaks the window but the next shot shows the window unbroken.
Plot hole: If the creatures are strong enough to simply burst through the walls, as shown at the end of the film, then the creature upstairs should not have been stopped by the small door that Bozo, the bartender and heroine shut on it to stop it. It was one of the larger creatures as well, so it could have easily gotten through.
Factual error: In the scene where the Gingerdead Man is finally defeated, he fires a six shot revolver at the hero seventeen times without reloading.
Continuity mistake: Near the end of the film, when Ranger boss Rick Bailey drives up to the ranger station, the licence plate number on his Jeep is 39697, but when Ranger Danielle crashes it into the cave, it's 37504.
Other mistake: After the Joker has become a vampire, you can still see his reflection in metal poles and such while he is chasing Batman in the bloodbank. (00:47:00 - 00:49:00)
Continuity mistake: Julian and Becky get to school and see one of their friends sparring a bit. His ex Katie arrives and he tries to kiss her. She pushes him away and then grabs again the strap of her bag, but at the cut she is not holding it anymore. (00:11:50)