During the dream sequence, when Vampire Gilligan gets into a fight with Skipper and the Professor's characters, large yellow words like "Pow" and "Oof" appear on the screen. This is a parody of another popular TV series at the time, "Batman".
Alan Hale has said that this was his favorite episode of Gilligan's Island. He would add that while making it he and the cast and crew had some of the most fun they ever had on the series.
During the dream sequence "Transylvania - 1895" Mr. Howell briefly holds Teddy, his Teddy Bear. The Teddy Bear was not invented until 1902.