FRANCOIS TRUFFAUT: One of the things I enjoyed in the film [Rear Window] was the dual significance of that wedding ring. Grace Kelly wants to get married but James Stewart doesn’t see it that way. She breaks into the killer’s apartment to search for evidence and she finds the wedding ring. She puts it on her finger and waves her hand behind her back so that James Stewart, looking over from the other side of the yard with his spyglasses, can see it. To Grace Kelly, that ring is a double victory: not only is it the evidence she was looking for, but who knows, it may inspire Stewart to propose to her. After all, she’s already got the ring!
ALFRED HITCHCOCK: Exactly. That was an ironic touch.