When the film begins it is clearly night. When the package is dropped off containing the ashes of Millard, it is day. In the same scene, the mother is outside shooting at the banner, and it is night again.
(at around 32 mins) When the shop owner approaches the Gingerdead Man, you can see the knife behind his back has a straight edge. When he cuts her finger off, the blade is serrated.
(at around 56 mins) After all the action in the bakery, where pastries are strewn about the floor, a milk container is tossed out onto the floor, a bloody body is dragged across the floor leaving a trail leading into the oven, and assorted other messes created during the action with the Gingerdead Man, when Sarah goes back inside to get her employee, Brick, just moments after the mayhem, the place is clean and neat as a pin.
(at around 54 mins) The gun, which should only hold a very limited number of shots, is fired roughly twenty or more times through out the movie, without being reloaded.
(at around 8 mins) Millard Findlemeyer is sentenced to die by electrocution. In Texas, a criminal's death is carried out by lethal injection, not electrocution.
(at around 36 mins) After the Gingerdead Man cuts the power off, electricity is still being used; there are lights, ovens, appliances on and working.
(at around 40 mins) The Gingerdead Man runs down Jimmy Dean with his own early 70s Chevy Camaro. However, the interior shot shows Gingerdead Man at the wheel of a 60s Ford Mustang. This is easily identifiable by the dash, instrument panel and steering wheel.
(at around 29 mins) When the Gingerdead Man is eating from and throwing out all of the cartons and boxes, you can actually see a human hand throwing them.
(at around 54 mins) When the Gingerdead Man gets the gun and starts shooting it you can see that a human finger is actually pulling the trigger.
(at around 35 mins) When Amos goes to get the gun from the car, as he does, in the background you can see a crew member standing around.
The protagonists in the bakery are unable to contact the police about the ginger-dead man murdering people because the land-line has been cut and Lorna's cellphone battery is dead. But they are not trapped in the bakery, multiple times characters walk in and out of the front door as cars drive by them in the street. Although it was late at night, they could have still flagged down a car or run to a neighbor and had them call the police.