Continuity mistake: The bomb is disarmed with 007 seconds left on the conveniently placed timer with big white numbers. Then, Bond says "Three more ticks and Mr. Goldfinger would've hit the jackpot." What? Well, originally, the timer would've stopped at 003, and the line would make sense, but later the powers that be decided to stop it at 007 instead for a good old Bond joke, and apparently never forgot to delete that line in editing. [The 3 clicks mistake is an interesting one as there are still in existence cuts of the film with the original 003 on the nuclear device timer. One contributor saw the 003 version in 1970 and was puzzled when the 007 version turned up on TV years later.]
Factual error: Goldfinger's disguised henchmen are dressed in Army uniforms, however, their rank insignia is Air Force.
Other mistake: Pussy Galore's flying circus is approaching Fort Knox flying in a V-shaped formation. Pussy is counting down from 5 to 0 before they release the nerve gas. On each count, we see another female pilot in a different plane but we also see another plane through the right side window. If you fly with 5 planes in such formation, only 3 planes can have another plane at their right side, not 4 or 5.
Visible crew/equipment: During the scene at the golf club, when the Rolls Royce begins to move off, the reflection from one of the film set lights can be seen on the rear left hand side of the Rolls Royce: There is no way that this could have been the relection from the sun, because the weather during the scene was on the dull side.
Continuity mistake: After the game of golf between Goldfinger and Bond, Goldfinger gets Oddjob to show off his usually dangerous hat. He throws the hat at the statue and we see it fly off to the right of the screen, well away from the statue. Yet in the following shot, the decapitated head falls down next to the hat on the ground right by the statue.
Revealing mistake: When Bond is on Goldfinger's plane - if you watch closely when it shows the external view of the plane in the sky you can see the plane is a model with two wires holding it up. The model plane's design and configuration are also quite different in mid-air.
Continuity mistake: When Oddjob drives away from the golf course, Goldfinger is not in the back of the car for some reason, even though they show him in the car earlier.
Continuity mistake: You can see when the black Lincoln that Oddjob drives to the junkyard is lifted to be crushed, it has no engine.
Revealing mistake: When the small jet taking Bond to Washington is shown taxiing away from the assembled VIP the engines are not running (no exhaust) and one can faintly see a tow cable pulling the plane to the right.
Other mistake: The crushed 'cube' car is not the whole Lincoln; that kind of small cube is produced in junkyards from the body only, without wheels, drive train, etc.
Continuity mistake: When entering Fort Knox we see the laser cutting from left to right across the metal door, which is subsequently pulled out. But when we see the door from the inside, it looks as if the laser has cut also both sides. There was no time for that - and we do not see the laser make such movements as going up or down.