After the bomb explosion, when Sarah leaves, she stops in doorway and grabs the door side with the right hand. Between cuts, she appears without hand on the door at all.
Maurice encounters Henry in the street. It is raining and their raincoats are completely wet. However, when they appears indoors, showed from the front, their raincoats are dry.
Maurice kisses Sarah and lowers his hands just before he enters Henry's house. The next shot shows him gripping his tie with his both hands.
In Sarah's journal, the date of her breakup with Maurice - and the first V-1 flying bomb attack on London - is shown as June 18, 1944. The actual date of the first V-1 attack on London was June 13, 1944.
A London bus which appears towards the end of the film was built in 1950 and is of a type which was not introduced until 1947. The action is supposed to take place during World War II.
When Maurice receives a detailed report from Parkis, the private investigator, Maurice is dressing himself in the semi-dark, but it is evident that there is a major perspiration stain on the underarm of the shirt he is donning.
Although the story is taking place during and just after World War II, 1944-1946, all of Deborah Kerr's clothing and hairstyles are strictly mid-1950's; there are even some 1950's vintage automobiles visible in the background in many scenes.