Continuity mistake: On the airplane, when Eliot pushes the suitcase down the stairs, Snake grabs hold of it with his left hand and while holding the gun in his right hand with his right wrist around the stair bar. In one shot the gun is gone and he's gripping the stair bar with his right hand, then the gun reappears again. (01:13:23)
Factual error: On the first murder atempt on Arthur, when the assassin shoots, a bullet hole shows up in the door, and then the bullet goes through. It should in fact be the other way-with the bullet passing and then the hole appearing.
Continuity mistake: When Desalvo's bullet hits Arthur Herk's TV the glass shatters and the bullet hole is visible on a black background towards the upper left. But in following shots much more of the glass is intact, with a large jagged hole in the glass surrounding the area of the bullet's impact. (00:16:15)