I've been rewatching a few of these recently, and many of the guest stars (i.e. The Three Stooges, Batman and Robin, Don Knotts, and The Harlem Globetrotters) appear in two or three different episodes. In many cases, most prominently the Harlem Globetrotters, I felt like the second appearance of the guest was better than the first and gave us a chance to know the guest star a little better. That got me thinking, are there any guest stars that appeared once in this series that you think could have benefitted from appearing in a second episode?
I would have liked to see Tim Conway, Don Adams, or maybe Laurel and Hardy appear again. Maybe Sonny and Cher or Laurel and Hardy as well.