A pilot episode was filmed that did not include either Robot or Dr. Smith! This film was not broadcast in 1965 but was shown on TV and released to video in the 1990s.
Starting in 1992, the Sci-Fi Channel aired prints that deleted the "TO BE CONTINUED..." lettering from the cliffhanger freeze frames at the end of the season 1 and season 2 episodes. These prints also had numerous cuts within the episodes.