The used car salesmen Dunstan and Dudley (Dennis Price and Peter Jones) were based on characters from the BBC radio comedy series "In All Directions" broadcast during the 1950s. The radio characters were known as Morry and Dud and were played by Peter Ustinov and Peter Jones who also wrote the scripts together with scriptwriters Frank Muir and Denis Norden. Their catch phrase "run for it!" was reprised in the film.
In this film in 1960, Ms Scott was 22 years old, while Ian Carmichael was 40 and Terry Thomas was already 49! A slightly scandalous age difference that was important at the time in real life, but totally ignored for the film industry.
The tennis club featured here later appears as The Elizabethan Hotel In Avengers episode Wish You Were Here [12/2/69] and as Merston Manor In Randall & Hopkirk (Deceased) episode The House On Haunted Hill [16/11/69]