Continuity mistake: In the scenes before and after Grant (travelling as Nash) joins Bond (travelling as Somerset) on the train, there are several insert shots showing the train from outside. Some show a Continental 2-8-0 locomotive with three headlights, towing black coaches with square windows and towing several vans. Some show a British 4-6-2 loco without headlights, and with British Railways legible on the tender; towing green coaches with rectangular windows. Oops. (01:20:00 - 01:30:00)
Plot hole: Bond lies to Tanya on the date the embassy would be bombed (Karim and Bond knew the 13th) and Tanya denoted the deception by telling Bond when he came in the decoding room she thought it was the 14th. How did Grant know to A: be on the train and B: have an entire escape plan set up for the wrong day?
Audio problem: As Grant throws a knife at one of the gypsies at their camp there's a swoosh sound. The sound is way too long considering how near he is and how hard he has to throw it in order for it to be lethal.
Continuity mistake: When we see the agent waiting for Bond at the Zagreb train station, he has a handkerchief in the pocket on the right-hand side of his suit coat. When he is talking to Bond on the train platform, the pocket is now on the left side.
Continuity mistake: When the train conductor takes Bond (as Mr Somerset) to the compartment where Kerim Bey and the Russian have been killed, you can see that Bond is standing in front of the door of the compartment when the camera is in the corridor. When the conductor opens the door to the compartment, Bond can be seen standing on the far side of the door and is not seen until right before he enters.
Continuity mistake: When Bond says "Tell our host his hospitality overwhelms me," after the belly dance at the gypsy camp, Bond takes the handkerchief out of the pocket of his suit and starts wiping his hands with it. He is not wiping his hands in the next shot, but in the shot after that, he is. (00:40:20)
Other mistake: When Bond has knocked out the truck driver who was going to meet up with Grant, the driver is lying on his back. Bond grabs a bit of shirt and easily flips him over onto his belly. There is no way a person can flipped over so easily and with so little leverage.
Continuity mistake: When the man from Q branch shows the briefcase to Bond, he removes one of the ammunition sleeves from the case, opens it, slides a few rounds into his hand and then starts to return the rounds to the sleeve. Just before the cut to the throwing knife coming out of the case, Bond is still trying to put the rounds back into the sleeve, with the cap of the sleeve being held between his thumb and first finger of his right hand. At the cut, all the bullets have been replaced and the cap is back on the sleeve. When it cuts back to the wide scene, the cap is off again and Bond is now holding it in is left hand. (00:21:50)
Audio problem: When Krilencu kills a guard with a knife at the gypsy camp, he then says "Quick!" but his lips don't move. (00:39:40)
Revealing mistake: When Bond and Kerim are sailing in the underground reservoir, just before they arrive at the Russian Consulate, there is a closeup of the oar moving through the water. At the bottom of the screen there is a white object moving through the water. It is not clear what it is, but it is not there in any of the other shots of the boat - neither before nor after. It could be the leg of a crew member pushing the boat. (00:33:50)
Factual error: When the train arrives in Belgrade the clock on the station shows 6.32. It is dark! That is not only 32 minures since the location where Bond was suppoesd to get off the train, where it was bright daylight. Furthermore it is shown that the train passes through Bulgaria and Yugoslavia. That will take more than 32 minutes. However it must be evening and not morning, because it continues to be dark in the next clips where the train drives to Zagreb.
Factual error: When the train passes the road crossing where it should have stopped - at 6pm - it is very bright daylight, and the sun is high in the sky (which can be seen from the shadows, among others those cast by the car on the road). The sun is never so high at 6pm in western Turkey/eastern Greece. That scene has been shot earlier in the day.