Continuity mistake: In the plane chase scene, when the plane hits the car, one of the wheels comes off. In the next view, all the landing gear is intact.
Continuity mistake: After Madeleine tells Bond, "I love you," her right hand slides off his face. Cut away and back, and her hand is back on his jaw in a shot of her. We then cut to a shot of Bond, and her hand isn't on his face at all. It goes back and forth like that between shots.
Continuity mistake: During the train ride in the desert, Dr. Swan has an extreme red lip gloss when she enters the scene. In the next sequence, she appears in the storage car, the lip gloss is gone.
Continuity mistake: During the plane/car chase scene, the plane rams the back of the Range Rover, and we see the nose crumple as it should. In all the shots after this, the nose is perfect, but the back of the car is still smashed.
Continuity mistake: When Hinx appears in the dining car on the train, the rest of the passengers in that car immediately disappear. Also the barman when they enter that part of the train and the kitchen staff too.
Continuity mistake: At the funeral in Rome the bars of sunlight on the wall behind Monica Bellucci change length through the conversation. The time of day for each shot must have varied quite considerably.
Continuity mistake: In the tunnel where Bond's Jaguar is wrecked by a truck it shows Moneypenny, Q and Tanner getting shot at, which shatters the right rear window where Q is sitting. Shortly after, they meet up with M to race away, and only a bullet hole is seen in the same right rear window of the vehicle. (02:02:20 - 02:02:50)
Continuity mistake: When Hinx smashes Sr. Guerra's head against the table, it falls on some papers. When the angle changes they're gone.
Continuity mistake: Bond leaves M's offices, walks through the patio, and crosses a rounded pattern on the center. In the close-up, he's several meters behind, walking by the pattern again.
Continuity mistake: When M scolds Bond about the Mexico incident, the position of the newspapers on the table changes between shots.
Continuity mistake: At the start of the car/plane chase the road is completely wet. After the cars exit the tunnel the road is bone dry. When the cars turn off the road into the trees the road is completely wet again.
Continuity mistake: When Hinx shoots at the plane he only shoots 3 times but the damage on the side shows 5 shots were fired. He's using a double-barrelled pistol which fires two shots at a time, so there should have been 6 holes - it's not accurate enough for two bullets to go through one hole.
Answer: It is mentioned that Oberhauser died 20 years ago. This could have been many years after James stopped living with him.