Bub's real name is Michael Francis O'Casey (he's father-in-law to Steve Douglas). When Mike was a child he had problems saying Grandpa...it always came out as "Bub". Hence the nickname stuck.
During the final few minutes of the episode, Steve mistakenly first introduces his son Mike as Robbie when he points his finger and says, "This is Robbie and that's Robbie over there, Mike there, and Chip there"
The scene of Chip complaining about Doreen giving him the "klunky eye" would be reused years later in The Honeymoon (1970) when Chip elopes with Polly.
Tim Considine, who played Mike Douglas, was married (1965-1969) to actress Charlotte Stewart, who played Miss Beadle on the TV series "Little House on the Prairie".