Urko: These humans are dangerous, don't you understand that? They think that they're as good as we are.
When Dr. Zaius and the gorilla soldiers ride up to the crashed spaceship, his hair is mussed in the long shots and properly groomed and neat in the close ups.
In the early 1990's, Roddy McDowall (Galen) was asked what happened to Burke and Virdon after the series ended, as it was abruptly canceled. He replied they found a rocket ship ship, took off, and went back to their own Earth and time.