- Dyeing for Your Art: Buster Crabbe and Jean Rogers both had to have their hair bleached blonde; Crabbe reportedly found the result disconcerting and wore concealing headware whenever he wasn't in front of the cameras. Charles Middleton got away with only cutting his hair short enough to fit under a bald wig, though the glue holding it in place caused its own problems.
- The Other Darrin: Carol Hughes took over as Dale in Flash Gordon Conquers the Universe, which also had new actors in the roles of Prince Barin and Princess Aura.
- Prop Recycling: Futuristic props from Just Imagine.
- Recycled Set: Sets from The Hunchback of Notre Dame, The Phantom of the Opera, Frankenstein, and The Mummy, among others.
Trivia / Flash Gordon (serial)