Gaffes

Foster has let the getaway car drive into the harbor basin. He watches until it has completely sunk within a very short time, and runs away. Immediately afterwards, a police car arrives in the same alley that Foster used and the police officers see the same last seconds before submersion as Foster (identical shot). This would only be possible if Foster and the police officers were at the same point on the waterfront at the same time.

When Mrs. McBride goes to visit Purvis at the motel, she throws her coat on the sofa and lands stretched over it. On the following cut, as she sits down with Purvis, the coat is now on the other end of the sofa and folded up.

The small private plane chartered by Purvis is flying out of a small airfield. But the airfield and airplanes shown in the background of the tower is a major commercial airport with large passenger airplanes.