Towards the end of the movie Big Daddy gets shot many times in
the body inflicting large bullet holes, including his upper right chest area. At the end, when he turns to look at Riley and the others, the bullet holes are not there.
The main zombie antagonist, who is seen throughout the movie, carries an AUG assault rifle and fires it repeatedly. However, he cumulatively fires more than the clip can hold and is never seen reloading.
In one scene, John Liguizamo is carrying a box of Champange, and a box of cigars. In the next scene, the box of cigars has disappeared, only to reappear in John's arm, as he deposits the box of Champange on Dennis Hopper's counter.
In one scene, Cholo is carrying a box of Champagne, and a box of cigars. In the next scene, the box of cigars has disappeared, only to reappear in Cholo's arm, as he deposits the box of Champagne on Kaufman's counter.
In the scene when the stenches break down the wire mesh gate (about 37 minutes in), a guard in the tower throws a rope and slides down (to be eaten by stenches), even though a perfectly good ladder can be seen on the tower.
When one of the military men attempts to throw a bomb his hand is cut off by a zombie. He falls to the ground, covering the bomb he was holding and gets blown up. When his body lands, his other hand falls off, revealing that it's a mannequin hand.