According to the DVD commentary, the entire budget for Underworld was the same as the highway chase scene in The Matrix Reloaded. See more...
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Underworld (2003) - 38 mistakes
Yes, everyone knows that vampires conventionally don't have reflections, but almost every vampire film adapts/alters the legend to fit the story they want to tell (after all, originally vampires could go out in daylight), so them having reflections in this film isn't a mistake.
Revealing: When Selene is firing her guns in the floor making a circle of holes so that the floor collapse, you can see in some shots the angle of her guns are pointing all kinds of directions. Instead of making a perfect circle the holes would be spread around the floor and the bottom of the walls in the hallway.
Revealing: After Selene jumps off the building at the beginning and lands, there is a very large upwards pull (that stays in place until the camera cuts away) in her cape near her head that is in fact the drop wire running under her cape to the harness on her back (although the wire has been edited out).
Revealing: In the end fight scene between Viktor and the hybrid Michael, Viktor picks Michael up and throws him into a stone column. Terrible wirework then comes into play: Michael travels far too slowly towards the column for someone who was just thrown, he makes one perfect spin in the air on his way, and when he finally connects with the column, it's a delicate bounce off before the wire drops him on the ground. His legs don't even move from the "impact".