The people who chose which episodes went together on these video volumes always liked putting two good episodes with one of the weaker ones (or maybe it's just me).
"Sergeant Wilson's Little Secret" and "Everybody's Trucking" were both great examples of Dad's Army humour. The former was originally filmed in colour, but sadly it was destroyed by the BBC and had to be restored from a black-and-white version of the episode which had been shipped abroad for overseas transmission. The story focuses around Sergeant Wilson's panic when Mrs. Pike begins to talk about having a child, and he assumes that he's made her pregnant. Of course, there's more to it than that, but you'll have to watch it to find out. ;-)
"Everybody's Trucking" in my opinion was one of the strongest episodes in the series, with brilliant characterisation, some great lines, and a running gag in which several large vehicles get stuck by the side of a country road. A definite must-see!
"Things That Go Bump In The Night" was one of my less favourite episodes. It's full of slapstick, which is great if you like that sort of thing, but not much thought went into it, and there really weren't any intelligent lines that made me laugh. Still, on the basis of the other two episodes, call it four stars.