Factual error: When Farley Granger sneaks out of his flat to go to Robert Walker's house, there is an EXIT sign over the door. Maybe in a theater or cinema, but in a private apartment?

Factual error: When Bruno is on his way to Union Station, he's heading on a bridge away from the Lincoln Memorial, which means he's leaving Washington D.C. for Arlington, Virginia, or in other words, he's going the wrong way.

Continuity: When Bruno and Guy first meet on the train Bruno orders some whiskies and lights a cigarette. He talks with this in the corner of his mouth until the camera angle changes mid-sentence when it disappears without him moving.

Continuity: In the scene where Guy enters Bruno's house to kill his father, Guy takes out a flashlight to look at Bruno's map. In one shot, you can only see the map, and the light is very small and circular, but in a wider shot of Guy's upper torso, the light covers most all of the map.

Factual error: In the opening scene, two taxis pull up at Washington Union Station with the Capitol visible in the background. The Capitol is not visible from this point.

Factual error: At one point in the tennis match, Guy hits a ball that bounces twice before his opponent can get to it, but it is not called.

Factual error: Farley Granger meets a math professor on a train bound from New York to Washington, and is able to prove as much to the police. The professor got on in New York and got off in Wilmington, DE, while Granger boarded the train in the fictitious town of Metcalf, NJ, and rode on to Washington. Thus, they met between Metcalf and Wilmington. But the police say Granger could have boarded the train in Baltimore, by which time the professor would have gotten off and they never would have met.

Plot hole: If Guy was in such a hurry to get out of there, couldn't he have much more easily lost the match in three sets? Surely, a match loss would be a small price to pay to alleviate a murder charge.