When the heroes are first in the ghost town, the window panes change several times behind the buzzard that's on the window sill.
When the two helicopters first challenge the heroes of the movie, there are obviously no "anti-tank rockets" attached to them, as one of the main characters says.
In the previous movie ("Image of the Beast") to this sequel, Reverend Turner appeared to be killed (or at least severely wounded?), so how did he appear in this movie at all?