Continuity mistake: In the boat shootout, the same zombie (with the net on his back) is killed four or more times.
Continuity mistake: Note the final battle scene in front of the "house". That is, the house that was blown up earlier by a keg of gun powder.
Continuity mistake: Depending on what the zombies are trying to accomplish they either move veeeery slowly or at top speed, for example, when Kirk is on the boat, they swim with deft ability through the water but when they get on the boat and are ready to attack they move with stiff limbs.
Continuity mistake: When the swimmer-girl notices that her boyfriend disappeared and she walks back to the beach leaving the water, her back and chest are already dry.
Continuity mistake: Kirk leaves his ship and appears on land shooting at the zombies in the water. Yet he is not wet at all.
Continuity mistake: When the characters are shown in bullet time in the long shootout scene, they are all wearing different clothes than in the previous normal time scenes.
Continuity mistake: When the swimmer girl is walking through the forest looking for her missing boyfriend, at first she is only wearing her thong. In the next shot of her, she's wearing all the clothes she had on before she jumped in the water.
Continuity mistake: The guy who gets sprayed with acid in the face is holding a bandage on it shortly after getting sprayed and has a silver watch visible. The shot jumps from him to some one else and then back, where he has no watch visible, then back to some one else then back to him with his watch back but sleeve covering part of it.