Revealing mistake: Near the end, when Fred uses the rock to bowl over the bad guy, you can all-too-easily see his fingers make big indentations into the surface when he picks it up. Either Fred has the strongest hands in the world, or the rock is made out of something similar to paper mache.
Add timeMatty Blast
Continuity mistake: In the scene when there is a meeting in Slate & Co., the model of the modern quarry is facing towards the chairman's chair. But in the next scene, when Fred is alone there and Sharon Stone enters the room, the model of the modern quarry is turned around, facing the other side.