Trivia: The alien ships look almost like the Martian ships from the movie War of the Worlds minus the wires. However, they were neat to watch. Byron Haskin directed both Wars of the Worlds and Robinson Crusoe On Mars; thus, that is why they have the same spaceships.
Trivia: Paul Mantee was the main star of this movie and Adam "Batman" West was seen for several minutes at the beginning and the middle of the movie. Two or three years later, Adam West was the main star in Batman and Paul Mantee was one of Catwoman's (Julie Newmar) henchman.