Continuity mistake: Near the end of the film, Karl Malden is embracing Vivien Leigh. In one shot she has her left forearm against his chest, with her hand in the vicinity of his shoulder. In the next shot this arm is instantly around his neck.
Continuity mistake: When Stanley throws the radio out of the window, he throws it through the second pane of the right hand side, but when the camera comes back to it, it is now the left hand pane that is smashed.