The Penguin's Nest (1) - S2-E27
Trivia: The guest cameo in this episode is by Ted "Lurch" Cassidy, who appears at the window as Batman and Robin climb up the side of the building. Batman advises him to go back to playing his harpsichord - which has been regaling us with the theme from The Addams Family since the scene began.
Batman's Anniversary (1) - S2-E45
Trivia: Jim Lefebvre - who played one of the Riddler's henchmen - was the National League's rookie of the year in 1965 and later managed the Seattle Mariners.
Batman's Anniversary (1) - S2-E45
Trivia: This is the only two-episode story arc in which John Astin replaced Frank Gorshin as the Riddler. After settling a contract and salary dispute with the studio, Gorshin returned to play the Riddler one last time, in the show's last season.
Answer: It's wasn't unusual for multiple actors to play one character on this show. The villains on the TV Batman were played by guest stars, not regular cast members. George Sanders, Otto Preminger, and Eli Wallach played the part at various times. They may simply have only wanted to play the part once or twice, or they were later tied up with other projects, making it necessary to cast someone else. Other characters, like Catwoman, were also played by more than one actress.
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