Mr. Lucas's first name is given in early series as James but he's referred to as Dick Lucas, later on.
Did you notice that I was clicking my fingers, clearing my throat and banging my spoon on the table?
Canteen Manageress: I did notice it, yeah.
Captain Peacock: And what message do those actions convey to you?
Canteen Manageress: Well, when my two-year-old does it, it usually means he needs to go to the ...
Captain Peacock: ...
Character's first names vary throughout the series: Mr. Lucas is variously James or Dick; Mr. Harman starts as Harry, then becomes Beverley; the cleaner has three different names, always played by the same actress.
Closing credits were preamble with the caption, "You have been watching" followed by each actor, either breaking the fourth wall to the camera or still in character relating to the episode. Sometimes, like the episode "Camping In", this would include the customer shown in the store at night, long after it was closed, since the episode ended with the store employees spending the night in the store.