Continuity mistake: When the main character goes to visit the foreign girl she puts him to work raking leaves. Seeing the amount of leaves all over the lawn he puts into action a plan to quicken the task. Later we see a bunch of piles of leaves all over the yard. While speaking with the girl you can see the piles of leaves in the background. At one point, as they are speaking back and forth, the lawn has leaves spread out all over it. Then, as they continue to speak back and forth, the leaves are once again in neat piles.
Continuity mistake: When Dr. Gibbs snaps the watch back into place before he puts it in the box, he puts the yellow cover on upside down, as evidenced by the square on the face of the watch being at the bottom of the watch as opposed to on top. For the rest of the movie, the watch is normal.