After wearing the same clothes for at least 3 nights and three days, Steele's shirt still looks clean and freshly pressed.
Obvious stunt double for Raymond Burr during fight scene with Ray Milland.
Set in the 19th century but an aircraft's vapor trail is visible at one point.
On the second morning, when Nadine comes down the basement stairs, we can see that she is wearing 1950s style high-heeled shoes.
When Nadine learns that Steel watched her open her hope chest and look at her clothes, he says, "I'm afraid I couldn't help it. You looked pretty good." This implies that he watched her trying on her clothes. But she didn't put them on; she only held them up and looked at them.