* FranchiseKiller: Given the poor fan reaction to Z3 even in its day, and the fact that no more ''Zenon'' films popped up, it's safe to assume we won't be seeing anymore of this franchise anytime soon.
* TheOtherDarrin: Creator/RavenSymone originally played Zenon's best friend Nebula, then Shadia Simmons played her in ''The Zequel''...then Raven again played her in ''Z3'' (though only for a cameo; Nebula's cousin Cassie [[SuspiciouslySimilarSubstitute filled her role]]).
** Protozoa, played by PhillipRhys in the first movie, gets replaced in ''Z3'' by Nathan Anderson.
** Zenon's parents get replaced in the Zequel and don't even show up in ''Z3''.
* PropRecycling: The station staff wore [=EarthForce=] uniforms from ''Series/BabylonFive''.