Revealing mistake: In the final scene in the belltower you can see shadows from the surrounding trees. That's because this scene was shot at 3 in the afternoon. They just used a filter to make it look like it was night.
Continuity mistake: In the scene In the McKittrick hotel, the manager tells Scotty Madeleine often stops by but hadn't been by today. Incredulous, he insists on seeing her room but finds that she has disappeared. One shot shows her door left open and another shows it closed.Mark Pope