The "blink and you'll miss it" part of Smithers (Q's assistant who triggers the powerful door-slam) is played by Jeremy Bulloch. Only worth noting because we see his face for once, as he's most famous for a part where he wears a mask - Boba Fett in the Star Wars sequels. See more...
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Factual error: Bond tells Q at one point "I've lost my PPK." However, he has been carrying a Walther P-5 throughout the movie, and continues to use it in the later action sequences. A PPK never does make an appearance in the movie. The P-5 was also used that year by Bond in "Never Say Never Again").
Plot hole: When Bond is on the roof of the train ,he opens the roof panel on the rail car, jumps down into the car, and puts on a gorilla suit to hide. He does all this while the knife thrower is in the small car. Wouldn't the knife thrower have heard something? The roof panel opening alone would have amplified the train's noises, not to mention the air that would have blown in.