When Agatha Christie strikes the black ball on the pool table with the cue ball, the black ball banks off four rails and is on a path that would clearly take it to a point somewhere to the right of the lower left corner pocket and the ball comes to almost a complete stop before the cut. Yet, after the cut, the ball is shown rolling directly into the pocket.
When typing about his first meeting with Agatha Christie, Wally Stanton is using only his index fingers and they stay in the center of the keyboard.
Although set in 1926, a de Havilland DH-82 Tiger Moth is seen in the film. The plane had its first flight in 1931.
Agatha Christie runs away with one small suitcase. However, while travelling and staying at the hotel, she wears three different overcoats, numerous dresses and a variety of hats and footwear.