Dilly Carson relates to Alan Quinton that she found Singleton sitting by the fireplace with a bloody knife and a letter from which Dilly quotes the signature line, "I think of you my dearest as the distance promise of beauty". But during the climactic flashback, we see the letter with that very line burning in the fireplace.
(At about 1:18:38) By the window, Alan and Singleton sit with the sides of their heads pressed together. But when the shot changes, Alan is suddenly facing her.
(At about 11:05) While Alan and his fiancee Helen talk at the big tree, Alan's head is turned to face her. But when the shot changes, Alan is suddenly looking down and in front of him.
When Alan sees the archived newspaper article, the first brief paragraph is on topic. The second paragraph is unrelated and everything else on the page is gibberish.
In the letter that Beatrice Remington writes to Captain Quinton which she mails through the postal service, she writes that she saw Victoria "yesterday", which would have been yesterday to the time Quinton received the letter and not yesterday to the time that she writes the letter. Writing such a statement is therefore illogical, especially in not knowing how long it would take for the letter to be delivered.