- Acting for Two: Not only does Alan Young play David Filby, but he plays James Filby, both young and old as well.
- Cut Song: Singer and lyricist Peggy Lee wrote a song for the film called "The Land Of The Leal" which was not used.
- Dawson Casting: A forty-year-old Alan Young playing an eighteen-year-old James Filby. Also in the Reunion Show, a 70-ish Alan Young plays the fifty-something version of Filby (but the makeup is convincing enough to have him actually look the part.)
- Prop Recycling:
- The globe in the background when George is listening to the information rings was used in Forbidden Planet as the navigation sphere.
- The Time Machine itself becomes a plot point in an episode of The Big Bang Theory. (Although it's the original prop in-universe, the Time Machine seen on The Big Bang Theory was, alas, a replica in Real Life.)
- The air raid wardens in 1966 wear the uniforms from Forbidden Planet.
- Recycled Set:
- The grand staircase leading up to the great dome was a famous MGM landmark built for the 1944 version of Kismet that showed up in numerous films and TV shows over the years.
- The set used for George's house later appeared in three episodes of The Twilight Zone (1959). It was redressed to serve as the Sturkas' house in "Third from the Sun", as Professor Samuel Kittridge's house in "Long Live Walter Jameson" and as Sam Conrad's "native habitat" in the Martian zoo in "People Are Alike All Over".
- The cavern where the V9-Gamma survivors take shelter from a meteor shower and have their meetings in The Twilight Zone (1959) episode "On Thursday We Leave for Home" is a reuse of the Morlocks' lair.
- Stillborn Franchise: George Pal always intended to make a sequel, but he died before it could be produced.
- What Could Have Been: George Pal considered James Mason, David Niven and Paul Scofield for the lead role.
Trivia / The Time Machine (1960)