Factual error: After Gene Kelly sings "The Heather on the Hill", he sees more heather on the other side of the bridge. He starts across but Cyd Charisse freezes in horror, since to cross the bridge would break the spell over the village of Brigadoon. She then drops some of her heather in the middle of the path and runs back to the village. The camera cuts to Gene Kelly chasing after her, but the heather dropped on the path has disappeared.
Factual error: The Inspector has no authority at all to release a convicted murderer about to be executed. Even if he could, the police presence would have been greater and Margot would have been in prison clothes or at least in restraints.
Factual error: Jeff has been in a cast (for a broken leg) for seven weeks and has been in his apartment for most of that time. He tells his boss that he has one more week before the cast is removed and can then immediately go back on assignment as a photojournalist. By this time he should have been transferred to a walking cast and be using crutches instead of confined to a wheelchair, but he is still wearing a full leg cast that goes up to and around his waist.