In the original series of Planet of the Apes both Brett and Taylor arrive at different times.
Planet of the Apes: Taylor, Dodge and Langdon crash land according to their Earth time chronometer -November 25 3978
Beneath the Planet of the Apes: Brett mentions the reading on the Earth time chronometer was 3955 shortly thereafter he encounters Nova wearing Taylor's dog tags. Logically Taylor should not be arriving for another 23 years.Therefore would not know Zera, Nova or anyone else,
Later under the influence of grape juice plus (wine) Zera mentions that the was destroyed in 3955. 23 years before Taylors arrival. This doesn't bode well for Taylor when he finds no Earth. Kind of weird considering that Taylor actually nuked the planet himself. Gotta love Hollywood.
Was this ever noticed when the movie was being made?