When Mrs Harris first gets into bed in her flat, the bedside table is on the right, subsequently it's on the left.
Mrs. Harris spends the better part of a week having a dress fitted to her form, and yet it is able to be worn by another woman who obviously has different measurements.
Mrs Harris's late husband was in the RAF. However the photo shows him wearing an army battledress.
Racing greyhounds wear standard colours, depending on their number/trap. Dog 6 always wears black & white stripes with red numeral.
The setting is 1957 but in the pub they play Chuck Berry's Johnny B. Goode which didn't come out until March 31, 1958.
At the end of the film there are posters on the wall headed Royal British Legion. The British Legion didn't become Royal until 1971 - 14 years after the film was set.
The seating in the greyhound stadium is modern. Definitely not from the 1940s.
Mrs. Harris uses the phrase "you go, girl," which did not originate until the early 2000s.
Upon arriving in Paris, Mrs Harris walks along the street from the airport to the city. There is a Peugeot 404 parked on the road. The 404 was not launched until 1960, when the movie is set in 1957, which ties in with the Parisian garbage collectors' strike of that year.
Whilst being driven around Paris in the red car, camera equipment can be seen reflected in the car's paintwork.