I have been watching reruns of the original BATMAN series on the channel THE HUB and was wondering why in the episode about Batman's anniversary, why the RIDDLER was played by John Astin and not by the regular guy- Frank Gorshin? I think if I remember correctly, I read somewhere- I think on tvtome.com that Frank Gorshin had a prior commitment such as filming a show or movie and couldn't do it. Is that the reason? Thanks.