When Laura is running away from Dr. Lynn's apartment in the rain, her book is next to her body, under her purse. Halfway down the street, the angle changes on the still-running Laura, but now the book is outside her purse. And it never gets wet!
Carnforth Station has had its name board covered and replaced with a big sign reading Milford Junction, but the smaller platform notices (behind Laura when Alec tells her about the job in South Africa) still show the next train's destinations as Hellifield, Skipton, Bradford and Leeds.
When Laura buys a brandy for herself late in the film she hand over a single coin which the girl throws into the register without giving change. We later see that she rang up 10d, the price stated earlier in the film for the same drink. The was no 10d coin.