When Crawford escapes with the money, leaving his partner Morgan in the lurch, Morgan is holding a revolver and Crawford an automatic pistol. But when Morgan catches up with him, Crawford is now holding the revolver and Morgan the automatic pistol. It's easy enough to blame the continuity girl for her lax work here, but the actors should at least have remembered what guns they were supposed to be holding from the previous scene.
When the gang are sitting in the car outside the Siban embassy, two young ladies pass them crossing the road. In the first shot, the lady in the white top is on the left as we look at them. There is a 2-second cutaway shot of the guys in the car, as the Colonel looks lustfully at the ladies, and then there is another shot of the ladies from a different angle, but now the lady in white is on the right.
Joe Preedy tries to electrocute Dominic in the tunnel after the robbery by forcing his head onto the outer rail, but it's a running rail and not electrified.
During fight after the raid, Preedy trying to hold Dominic's head against a live rail. He is not wearing any gloves and would also be electrocuted if successful.
When the three men crouch down between the track and the platform edge at Belgravia station to make their way into the tunnel at the end of the platform, the running rail (the one nearest the platform) can be seen to come to an abrupt end. No train could possibly run on such a terminated rail.
Prior to the heist, as the boys are discussing percentages of the take that each will get, Christine puts an album on the record player, but the music starts playing before the record even falls to the platter.
During the robbery, the thieves enter the room and, working without gloves, leave their fingerprints all over the crime scene.