After the restaurant meal, Delauney apologizes that he can't give them both a lift because he only has his two-seater, so he offers to take April home in his two-seater. Later, though, both men travel in the car to the second tennis match, apparently intending to collect April on the way.
The neon sign outside the restaurant is wrongly spelled "Camelia Room". The menu shows the correct spelling, Camellia.
When Henry is trying to get a table at the restaurant, the position of the headwaiter changes between shots when Henry tries to look at the reservations book.
In the woo-manship class, which, according to the notice board is run by a Miss Grimmet, Palfrey refers to her as Mrs. Grimmet.
When Palfrey beats Delauney at tennis, the shadows are wrong. At several points the shadows are behind both players.
When giving Delauney directions in the car, Palfrey says at one point "second right--no, third right". Delauney turns almost immediately, hardly time for even first right.
Ian Carmichael buys the car on May 21, postdating the scene in his office when the staff are listening in to a cricket test match, though test-match season did not start before early June.
The second time Ian Carmichael appears at the car showroom, the shadow of the camera is clearly visible on Peter Jones as he walks across the showroom.
In the opening scene, Palfrey gets of the train at a station with a prop signboard 'YEOVIL'. There is no station called plain Yeovil and the route map which Palfrey passes is for the northwest of England, far from Yeovil, which is in Somerset.