When Victor is massaging Rose's feet, in the close ups you can tell that a hand double is used because all 5 fingers are straight however Bill Nighy has Dupuytren's contracture which means that the last two fingers on both hands are permanently pointing inwards. This is visible in the wide shots.
(at around 1 min) During the car chase scene, Rose starts out driving and then during the chase she switches seats with Victor. The camera moves to the car chasing them and then cuts back to Tony sitting in the back. From behind you can clearly see Rose still driving.
(at around 20 mins) When Rose first goes into the restoration department of the museum she startles Gerry and he flinches, leaving a dab of paint on the left-hand side of the man's forehead just below the hairline of the painting he is working on. In the next camera angle he seen removing the dab with a cotton tipped stick from the right-hand side and there is no paint mark on the left side.
When Victor and Rose enter Victors home, they begin to talk about Victor's mother, but when Tony walks in with the Cat, the cat is facing front (Towards Victor) in the first shot, then in the second shot facing Tony, and the cat then puts it's arm over Tony's shoulder in that same shot, but again seconds later in the 3rd shot of Tony, the Cat is facing front again in the same position as the first shot.