When "the uncle" is sliding on the rope way/funicular (near the end), his position is changing with the shots. First he's lying in the pod, than he's hanging below it, and than again he's back in the pod.
When Larry enters the mansion of "the uncle" Mark the metal door creaks as if it is a wooden door. Yet when Larry later returns to the mansion the same door doesn't make any sound at all.
When David is fighting with the Russians in the burnt down school, there's a slow-motion scene where you can see the blue mat he's landing on.
Near the end Larry tells Brenda that they have to get to the place where they found "the golden horn". Yet neither of them was present, when the box containing the horn was dug out.