- Billing Displacement: The John Hyams-directed films. Both Van Damme and Lundgren had only a few minutes of screentime in both of them.
- Creator Killer: While Mic Rodgers has a long resume as a stunt co-ordinator and second unit director either side of The Return, he hasn't directed another film before or since that one.
- Real-Life Relative: Miles is played by Kristopher Van Varenberg, Van Damme's son.
- You Look Familiar: In the first film, Michael Jai White plays as an unnamed soldier who is part of Scott and Devereaux's Special Forces platoon, who goes AWOL when Scott begins massacring his platoon and the village they came across. He goes on to appear in The Return as an artificially intelligent computer system called S.E.T.H. who puts its program into a nanotech enhanced Uni Sol body.
Trivia / Universal Soldier