Because of the large number of well-known actors in this episode, the closing theme featured a credit roll of cast names instead of the usual still frames. The remaining non-cast credits were then done with standard still frames. This was the only episode of the series to ever use a credit roll.
This was the last Charles Beaumont Twilight Zone screenplay to be actually fully written by Beaumont himself. Around the time this episode was made, Beaumont (then only 34) began suffering from the rapid onset of a degenerative neurological disorder (believed to be either Alazheimer's and/or Pick's Disease) which affected his speech, memory and concentration, as well as causing him to physically age very rapidly. As the disease progressed, Beaumont was soon unable to meet his writing commitments. A number of his writer friends, including Jerry Sohl and William F. Nolan, supported Beaumont by ghostwriting stories with or for him and submitting them in his name, although Beaumont insisted on splitting the fees with his helpers. His last screen credit (also probably ghostwritten) was in 1965, by which time he was too ill to work at all, and he died on 21 February 1967, aged only 38, although his son later recounted that his father "looked ninety-five" at the time of his death.
In dining room sequence, veteran Australian-born actor Frank Baker plays the uncredited part of Otto Champion (whom Cecil Kellaway's character points out, sleeping in a chair). Baker was a lifelong friend of legendary director John Ford, and a member of the so-called "John Ford Stock Company", the loose collective of actors who appeared in multiple Ford films. In a career spanning almost sixty years, Baker amassed more than 240 screen credits, including appearances in four Oscar-winners, and seventeen John Ford films.
The couple in the original short story are in love and taking the trip for their honeymoon.