Blatant double for Booth Colman when Zaius is on horseback.
A dog follows the trio into the ruined city. If, as Cornelius and Armando stated in Escape from the Planet of the Apes (1971) and Conquest of the Planet of the Apes (1972), a plague had wiped out all cats and dogs, where did this dog come from? (Note: the appearance of the dog was not in the script. It was added during filming).