The photo of Morse in his lounge shows him looking towards the camera, whereas he was looking at his book when the flash went off. Further, the flash would have reflected off the window and affected the photo.
The rear view mirror in Morse's car is visible throughout but is missing in the final scene.
Despite Morse's supposedly profound knowledge of English Literature and proficiency with the English language, he uses the word "infer" when he actually meant "imply".