Continuity mistake: After Bond has wrecked Tilly Masterson's car, he takes her to a gas station. At the gas station, there is a orange camping tent visible in the background, When Bond leaves the gas station, the tent is suddenly gone.
Factual error: According to Bond's radar map, Goldfinger is driving north of Geneva. There aren't any mountain passes north of Geneva. The whole sequence (involving the murder attempt by Tilly) was filmed between the Furka Pass and the town of Andermatt.
Continuity mistake: The Falcon Odd Job is driving with the crushed Lincoln has whitewall tires when leaving the scrap yard but when he returns to the farm it has blackwall tires.
Continuity mistake: The first time we see Goldfinger by the pool, in the wide angle there's a girl with an orange bathing suit, and a man with a striped shirt next to her. In the close-up, the man now has a white T-shirt with a blue print, and the girl has a white bikini and an orange skirt.
Continuity mistake: By the pool, Bond is given a note by an agent. The way he holds the note changes between shots.
Continuity mistake: During the pre-credits, the amount of soap on the back of the girl that was taking a bath changes between shots.
Continuity mistake: During the pre-credits, Bond lights his lighter to check his watch before the explosion. In the close-up he lights it again.
Continuity mistake: During the pre-credits Bond enters a room and his hands are spotless. In the close-ups of him placing explosives they're very dirty.
Continuity mistake: When the head of the statue falls on the ground after being decapitated by Oddjob's bowler hat, the head is now bright white and no longer matches the colour of the original marble.
Continuity mistake: When Colonel Smithers says "That's not quite fair" during the dinner sequence with Bond and M, the position of Smithers' hand/cigar jumps between shots.
Continuity mistake: When Bond is knocked unconscious by Oddjob in Goldfinger's suite, the robe-knot on his dressing gown changes when he regains consciousness.
Audio problem: When Goldfinger is explaining his smuggling operation, his mouth doesn't move until right at the time he coughs.
Visible crew/equipment: When Oddjob loses the trunk, the film crew is reflected.
Continuity mistake: As the vault door closes the shadow of the running man can be seen at the door, which was still open enough to get through. Inside the vault, he just reaches it as it shuts.
Revealing mistake: As the laser cuts through the table towards Bond, the line where the cut is to appear is visible.
Visible crew/equipment: As Bond stands by the back of the car Goldfinger approaches, the reflection of the camera crew and equipment on the trunk can be seen.
Continuity mistake: When Bond gets in the car outside the hangar in Kentucky, we see Oddjob open his door to get in. In the close up of Bond in the next shot, however, we see the car door is now closed, but we still hear it closing in the shot.
Continuity mistake: When Bond and Oddjob are fighting to the death at Fort Knox, Bond retrieves Oddjob's lethal steel-brimmed derby hat and takes aim, preparing for a backhand throw with his left hand. Camera cuts to a startled Oddjob for a split-second. When the camera cuts back to Bond, he is executing a much more difficult forehand throw with his right hand.
Revealing mistake: When they're in the barn, Bond and Pussy take turns tossing each other in the hay. On her second attempt to throw Bond, he reverses it and throws Pussy. After the camera looks to where she will land, you can see the distinct outline where she had been thrown before.
Continuity mistake: When the cube of metal that was the Lincoln comes out, the electromagnet comes in and grabs it as it sits close to the exit. When the camera cuts to a wider shot, the cube is being lifted from a further distance out from the exit.
Chosen answer: They're not. Q was just indicating to Bond that these were the wing machine guns, he wasn't stating which was which.