Eustace Pockle is mentioned in this episode as shoplifting again. In the 4th season, there would be an episode centering around him: "Shoplifter at the Shady Rest"
Floyd recites a line from the movie "Reunion in Hackensack". An internet search shows no such movie with that title.
Kate calls Betty Jo by her full name on this episode, Elizabeth Josephine Bradley.
When they're trying to do the play, and Dog is missing, when he comes back, you can hear Billie Jo say "Higgins" followed by Betty Jo saying "You've come back". Higgins is Dog's real name.