* AdaptationDisplacement: Though popular at the time of it's release, the movie has largely fallen out of public awareness - most people are more aware of the [[FantasticVoyagePlot trope it created]] than the movie that spawned it. The novel, on the other hand, has never gone out of print, though the cynical would argue that this is due to Azimov's fame, rather than how good a job he did.
* AlternateCharacterInterpretation: The novelization explicitly states at the end that there's no way to know which of the numerous problems were sabotage or genuine accidents.
* BestKnownForTheFanservice: Raquel Welch in a wet suit. She's even the first to strip down.
* NightmareFuel: The whole movie has a strange, unnerving, psychedelic feel. The initial scenes in the submarine are also extremely claustrophobic, which explains Michaels's panic attack.
** Cora is attacked by antibodies in the inner ear, which causes her to scream bloody murder. She then complains of being strangled and unable to breathe. As if the claustrophobic feel of the movie wasn't enough.
** [[spoiler:Michaels' death - being digested alive by a phagocyte - is pretty grisly.]]