The show is now shot in color, starting with this episode.
The opening titles are now sung by a different group. Also, a change was made in the final line of the song. In the first season, Mary Ann and the Professor are billed as "the rest", and are not pictured in the opening. Starting with this episode, they would now say "The Professor and Mary-Ann!" and Dawn Wells and Russell Johnson are now shown in the opening with the other cast members.