Continuity mistake: The train is stopped because Spectre has pushed a 1950's style Dodge truck full of flowers in the trains path. Later, when James is driving it trying to avoid the grenades dropped from a helicopter, the truck has turned into a very different looking 1961 Chevrolet truck.
Continuity mistake: When JB is driving the truck and is being bombed with grenades from the helicopter the truck gets smoke blackened, but when he arrives at the speedboat all the smoke marks have gone.
Visible crew/equipment: When James Bond shoots down the helicopter then it crashes, he emerges from the rocks to run from the crash site to the right of picture, just as you see Sean Connery emerge from behind rocks from the right in the same scene. So for about a second there are two James Bonds in picture. One is the stunt man and the other is Sean Connery. (01:38:05)
Continuity mistake: Just after Grant has hit 007 on the back of his head and knocked him out, Grant searches through the pockets of 007, he takes out some money and puts it into his lower left side pocket. But when 007 kills Grant and searches his pockets, 007 takes back the money from Grant's inside top right hand pocket.
Continuity mistake: When Bond and Tatiana are in the boat chase and are being followed, they drop four cans of fuel in the sea. When Bond blows them up, there are way more than four fuel explosions in the sea. (01:43:15)
Revealing mistake: During the fight on the train between Bond and Grant, you can spot the stunt double for the Grant character by noticing the bad toupee.
Visible crew/equipment: When Bond is being led into the Bazaar in Istanbul spot the crowd being held behind a barrier.
Continuity mistake: When Kerim Bey is making a sniper shot towards a billboard with the rifle being steadied on Bond's shoulder, check out Bond's eyebrows - they are long in one shot, short in another....obviously painted on. (00:49:05)