As Captain Scott and Van Layden talk beside the trainload of massacred refugees, one of the dead men, wearing a yellow turban and hanging out a train window behind Van Layden, visibly raises his head, turns his face away in the opposite direction, then resettles his head in a more comfortable position, all while Scott and Van Layden are talking.
The movie takes place in India in the early 20th century, but 1950s British trains can be seen in the background through the locomotive cab windows at various times. (Some cab-interior shots were done on a studio set with stock background footage.)
Most of the rifles carried by both the British/Indians, and the rebels, are the Lee-Enfield SMLE, which was only just being introduced at the time and so unlikely to be in such wide use. However, when Capt Scott cleans one with a pull-through on the train (just after handing one to Peters), with the bolt removed a bridge charger guide is visible, which identifies it as a Mark III, introduced in 1907. There are also a couple of No. 4 rifles visible used by rebels, much later versions (late 1930s) of the Enfield.
(at around 1h 24 mins) During the conversation on the train, the background scenery is moving giving the impression the train is going backward, i.e. the engine was pushing the carriage from the back. In other scenes it was shown the engine was pulling the train from the front.