Even though the audience has seen a close-up of Charles Boyer's bullet wound behind the left side of his jacket, when he turns to say goodbye to Mitchell and Hayworth the left side of the jacket lifts, and there is no bloodstain.
The small single engine plane flown by J. Carroll Naish after he robs the charity event could not possibly have carried enough gas to fly him from New York to the Deep South, where the coat gets thrown from the plane.
When Harry (Cesar Romero) greets George (Henry Fonda) at the door, the boom mic's shadow is clearly visible on the wall.
At about 00:17:00 minutes, John Halloway (Thomas Mitchell) says: "Three years ago, I got an elk. There he is!" However, the animal head, mounted on the wall, that he points to is a stag, not an elk.