Re "The Dick van Dyke Show": According to this site that GUEST referred us to earlier, Greg Morris appeared in three episodes of the show. As catspaw said, he played the character Mr. Peters in the baby-switch episode "That's My Boy" (9/25/1963), and played Mr. Peters again in the episode "The Last Chapter" (6/1/1966). Does anyone remember that 1966 episode?

The third "Dick Van Dyke" episode Morris appeared in was "Bupkis" (3/10/1965), where he played Frank Mandalay. If I remember correctly, Mandalay was an old Army buddy of Rob Petrie, and together they confronted another Army buddy who had recorded and released a song the three of them had written together – but without the others' permission.