Don Drysdale invites Jeff and his family to see him play baseball with the best seats in the stadium, when they visit Los Angeles. Unfortunately, Jeff and his family never take Mr. Drysdale up on this offer.
Mr. Drysdales, though, does appear in several future episodes (total of 4 episodes counting this one). They are "Play Ball" (season 7, episode 3, 10/1/1964), "My Son the Catcher" (season 6, episode 31, 4/16/1964),"All Those Dreams" (season 5, episode 31, 4/18/1963), and this episode. All of these episodes take place in Hillsdale.