- Sequelitis: This movie remains one of the least popular of the Apes movies due to its cheap production, overly bleak and nihilistic feel, clunky political commentary, and the mutants feeling far too bizarre and off-the-wall even for this series. It doesn't help that it directly follows the original.
- Sophomore Slump: Both the first film and Escape from the Planet of the Apes are universally regarded as better films than this, and even Conquest of the Planet of the Apes has gradually come to be seen as a better sequel due to its better production and more insightful political commentary.
- Strawman Has a Point: Dr. Zaius's anti-scientific, technophobic and anti-human worldview doesn't seem so crazy when Taylor uses a human-built bomb to blow up the entire planet at the end. However, it's possible that Taylor blew up the entire planet because of Zaius' hypocritical viewpoint that humans are violent... just as an army of apes shoot Brent.
- Special Effect Failure:
- All the budget for ape prosthetics clearly went into the full-body suits for Zaius and Ursus, along with Cornelius and Zira. As a result, the remaining prosthetics range from mediocre to downright awful, especially in the scenes showing large crowds of apes. Some of the unmasked mutants in the church scene also look pretty bad.
- The illusions that the Mutants create to deter the Apes look so laughably bad that all the members of the ape army except Zaius come across as complete idiots for being scared of them.
- Values Dissonance: When Brent and Nova drop in on Zira and Cornelius, only to subsequently have to hide when Dr Zaius comes by, Zira has to pretend the bloody rag (she was using it to treat the wound on Brent's arm) is because Cornelius hit her because she misbehaved. What would seem like a ghastly bit of spousal abuse to human viewers is barely remarked upon in the scene. No one seems to consider it unusual behaviour, especially Zaius who came to scold Zira and even then he refrains Cornelius from hitting her again.
YMMV / Beneath the Planet of the Apes