- The final scene in which Caesar is giving his "equality" speech was added after the film's completion. This is why the final shot is only of Caesar's eyes and is of a grainy quality; the shot was just a cropped piece of footage from earlier in the film. Roddy McDowell was brought in the read the final lines, which were then edited into place and the film re-released.
- This is the only film from the original "Planet of the Apes" series that was not rated G.
- J. Lee Thompson co-owned the rights with Jacobs and was originally going to direct the movie.
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