Factual error: Mrs Slocombe's cat gives birth, but the kittens shown at the end are way older than ones who are supposed to have been born just moments before.
Factual error: 2016 special - You Can't Teach An Old Dog New Tricks: Mr Harmon comments on a perfume called Belle, which he thinks is called "Belly", "I wonder what the next one will be called. Bingo Wings?" The episode is set in 1988 and the term "bingo wings" didn't exist before the 1990s. (00:10:40)
Answer: That wasn't possible in 1972. Until recently squatting was a civil offence in the UK, not a criminal one, and removing squatters was a complex and time consuming business.