Urko: These humans are dangerous, don't you understand that? They think that they're as good as we are.
Other mistake: The main characters are always clean shaven, the same clothing is worn and their hair never grows from episode to episode.
Trivia: The Planet of the Apes TV series was filming in the same California hills the same time as M*A*S*H. Both shows were merely one hill away and over from the other.