One of the story lines involves a character who his registered to play in Wimbledon, but he played one year as a pro so he should be ineligible (he lied so he could play). That was true in 1962 when this episode was filmed. However, starting in 1967, Wimbledon was opened to both amateur and professional players.
This episode features three actors from the James Bond franchise: Roger Moore (James Bond, Live and Let Die (1973), etc.), Honor Blackman (Pussy Galore, Goldfinger (1964)), and Anthony Dawson (Professor Dent, Dr. No (1962), Blofeld, From Russia with Love (1963) and Thunderball (1965)).