The oral counting of the 75 seconds while copying the keys at the rail station is only accurate for the first 13 seconds when the stopwatch is shown, but then it slows down. Overall, it's a total of 140 seconds.
When Clean Willy escapes from jail, the shadow & sunlight on the ground change dramatically from when he first runs across the yard to when he makes it over the top of the wall.
During the robbery sequence, the telegraph line beside the track appears and disappears.
When he reaches the top of the train and throws his jacket away: In the next shot, before the camera pans out, both cars are completely empty.
In Trent's garden, Emily Trent is talking about the water wheel. The position of her umbrella changes between cuts. Sometimes it is resting on her shoulder, sometimes it is held higher.
If the gold shipment was solely to pay British soldiers in Crimea, as asserted, it would have been in the form of barrels of gold coins, not gold bars as shown.
If you look carefully, it's easy to see that the four keys requiring all of this work are just two pairs of duplicate keys - and, to any locksmith, it's obvious that the keys shown are for lever locks. Not only are they pretty easy to pick (even back then), the extensive waxing procedure shown to duplicate the keys wouldn't have been necessary - one side of the key is all that's needed for a copy.
In one of the movie posters, modern American dollars are shown instead of pound notes, representing the loot, even though it was not paper money at all that they were after.
The film makers are not responsible for movie posters.
The film makers are not responsible for movie posters.
When searching for the key in the wine cellar, a flashlight is being used. Flashlights weren't invented until approx. 1902.
It was not a flashlight. It was a bull's eye lantern.
It was not a flashlight. It was a bull's eye lantern.
At c. 80 minutes the guard remarks that the run between Redhill and Ashford is the fastest part of their journey. This is perfectly correct. Although Redhill (in Surrey) is on a completely different railway line from Ashford (in Kent), the original railway to Folkestone went this way and this was the route until the South East Mainline was built, in 1868, a decade after this film was set. (And Redhill to Ashford is a very straight, flat and fast route.)
Obvious use of matte painting to fill in the cityscape in the hanging scene.
During the fireworks scene at the palace, the fireworks are clearly being set off from, and are exploding, behind the palace, however the crowds are standing in front of the palace facing forward, away from the show.
When Mariam is shaving Pierce with a straight razor: She runs the razor upward along his throat, well into his beard, seemingly to no effect.
She again runs the razor upward, to what appears to be the actual edge of Pierce's beard...All while working from a position that would not allow her to directly see the underside of his jaw.
If the bags were filled with gold bars they would not have been so easily thrown off the train.
As the main characters relate what they've found from casing Mr. Trent, Miriam's information ends with the statement that "Altogether there are ten servants employed" (in Trent's household). Agar then picks up the narrative with the specifics: "A coachman, a gardener, a doorman, a butler, a cook, and two upstairs maids" -- his list, presumably intended to be exhaustive, gives only seven servants.
During the opening credits train scene, the engineer's hat blows off, and both he and the fireman appear to pause for a moment to consider the situation.
When practicing the timing for Sutherland to run up the stairs, they're shooting for 75 seconds, and they say he did it in 74. It actually took 22 seconds.
Transparent stay up stockings, as removed by Lesley-Anne Down in the first bedroom scene, were not invented until the mid 20th century. At the time the movie was depicted hosiery was opaque and waisted, these were called nether-stocks.
The climactic Connery run along the car tops would have been impossible in 1855, as he would have been seen by the necessary brakemen. The train in the film uses Westinghouse brakes but these had not yet been invented.
During the 'raid' on the brothel and in some other scenes, two-tone police whistles are blown. These whistles were not in use by British police forces until the 1870s. Constables in 1855 used a type of football rattle to call for assistance.
When looking at the mansion from the outside, you see lights coming on through the windows as a person is running from room to room in the middle of the night. These lights very rapidly come on as if someone is flipping electric switches. However the movie is set in 1855 England long before electric lights.
When casing Mr. Trent, Miriam's information states that his youngest son "has a tendency to sleepwalk", and an evening scene from the outside showing Trent's entire household being roused, with multiple rooms each being brightly illuminated instantly as if by a switch. In 1855, electricity was not yet in use in British households.
During the first conversation between Pierce and Agar, the dolly tracks are reflected in the shop windows.
Visible wire supporting Clean Willy as he climbs the wall of the prison.
The Folkestone main line has always been double track.