To create the melting painting effect, the painting was reproduced in wax and mounted to a hotplate.
Mrs. Bronson says the painting reminds her of the tallest waterfall in Ithaca, New York - probably Taughannock Falls in Taughannock State Park, 11 miles north of Ithaca, where Rod Serling lived and where he taught at Ithaca College for several years.
Rod Serling's original script featured two characters who did not appear in the finished episode, a police officer and a refrigerator repairman. These roles are significant not only because Serling wrote them, but because he went so far as to cast them before he cut them from the script (Ned Glass was slated to be the repairman and John McLiam the police officer). Why they were cut probably traces back to Twilight Zone's budget problems, which had been growing significantly since James T. Aubrey, Jr. became chief executive of CBS in the show's second season. Similar problems occurred during the shooting of The Self-Improvement of Salvadore Ross (1964).
When Norma unpacks her groceries, they are: a bunch of carrots, a loaf of bread with the brand name "Gordon's", and at least one can of grapefruit juice.