Revealing mistake: During Caesar's big speech at the end, you can tell in some of the close-ups of his face that his mouth isn't moving.
Conquest of the Planet of the Apes (1972)
Ending / spoiler
Directed by: J. Lee Thompson
Starring: Roddy McDowall, Ricardo Montalban, Natalie Trundy, Don Murray, Hari Rhodes
Caesar leads the apes to a takeover of the city. Once it has been completed, he declares that this is just the beginning, and that next they will exterminate every last human and become rulers of the Earth. The other apes don't agree with him, though, and he backs off, but promises that one day, their world will become the Planet of the Apes.
Dave
Woman: [Talking about cigarettes.] Funny, now that I know these things won't kill me, I don't enjoy them.
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Chosen answer: Caesar wasn't the only surviving ape, just the only surviving talking ape. Conquest of the Planet of the Apes is set roughly 20 years after Escape from the Planet of the Apes, and in that time man began to keep apes as pets (disease wiped out dogs and cats) and (most likely through breeding), the apes evolved into what we see in the film.
Bishop73