The episode titles "Oh look - it's average-sized Trevor Chaplin", "Hello Sir, Hello Miss", "Is he the lodger?" and "What do we have on hockey sticks?" are the opening lines of each episode.
Big Al is said to have been busy in the Midlands recently: this is an in-joke concerning the actor, Terence Rigby, who had played Tommy 'Bomber' Lancaster in Brummie soap Crossroads (1964) between the first story and this follow-up.
Cavity wall insulation is mentioned in each of the four episodes of the series
Several times throughout games of bowls are shown in progress as the bowling green is where Big Al now conducts business. But at no time is a jack ball - the white ball thrown first and towards which subsequent play is made - ever shown. This is always the case but is perhaps most obvious when Big Al and Little Norm walk towards the end discussing the score where the absence of a jack makes a nonsense of both the game and their conversation.