Other mistake: The alien that comes out of the dog is a lot bigger than the actual dog just seconds after it appears. This only applies to the theatrical version, as in the extended version the alien comes out of an ox.
Other mistake: When Dolph Lundren shoots his boss he shoots him through his glasses in his eye. However the guys lens never breaks. His glasses fill up from the inside with blood. (00:52:50)
Other mistake: When Tod is going outside to see a statue of himself, as he gets closer to the door he runs into it, but he actually jumps at the door.
Other mistake: In the scene in Angelo's basement after Jobe has killed the Priest and his friend's Father, Jobe transmits a message to Angelo using the VR helmet. In this message we see and hear Jobe describing how he took a boost of medicine, but how did Angelo hear this message? The earphones of the VR headset are positioned above his head and angled away from him. (01:13:40)
Other mistake: When D-Day discovers that the intestinators are magnetic, he puts the spare intestinator on himself to demonstrate. There are no troubles at all. When Stiggs volunteers to go first and have his intestinator removed from his body, not only does D-Day struggle to find where it is located, but you can also see where the intestinator moves inside his body where it didn't with D-Day's body. (01:04:30 - 01:07:00)