Revealing mistake: When Albert and Harold are fighting over the cracker Albert's face goes into the trifle, and if you look carefully we can see that he just lets go of the cracker and puts his head in the trifle deliberately.
Revealing mistake: When Harold and Albert are watching football on TV you only see the TV set from the back. If you look through the air vents you can see straight through it it - obviously a prop with no screen in it.
Chosen answer: There is no definitive answer. In the original run of the series in the early sixties, Harold was given a birth year of 1925, matching that of Harry H Corbett, who played him, making him old enough to have fought in the war. When the show was brought back in the early seventies, his birth year was, for no immediately obvious reason, revised to 1932.
Tailkinker ★