A bed-knob on Bobbie's bed is loose and changes positions between shots when she and her mother discuss the newspaper report on her father's sentence.
When the toy train blows up we see the dog running out of the house into the bushes on a clearly spring or summer's day. However, it is supposed to be at Christmas time. The next time we have an outdoor shot, it is snowing heavily.
The Russian gets off a train at Oakworth a few moments later another train pulls up and the children's mother gets off. It's a single track and trains wouldn't travel along it so close together.
As the engine approaches Bobbie in the 'landslide sequence' and comes to a halt, drifting steam is seen coming down from the sky and entering its funnel, indicating the shot is actually reversed footage of the train backing away from Bobbie so as to not endanger the actress by attempting a precision stop inches away from her.
At the end of the film as the children go through the gate into the field a tree "falls over" the stone wall on the right hand side of the picture.
When the children catch their first view of the 'Green Dragon' express thundering out of the tunnel adjacent to their home, a shot of the fireman stoking the locomotive shows a stationary bush in the window behind him, indicating the sequence was shot on a halted engine.
During Roberta's birthday party scene, she is clearly not walking around the room but being pushed on wheels, possibly standing on the front of the camera dollie.
In the last shot of the brass band playing during the presentation scene at the railway station, a vehicle can be seen in the distance travelling from right to left.
At the end of the film when Charles Waterbury arrives at the station every one knows because as Perks points out it's in the paper. The only ones who don't know are the family who in fact would have been told before the newspapers.
When the children run down the meadow towards the railway line (near the end of the film) you can clearly see a white car going along a road towards the top of the screen. This film is set in 1905.
When the family move to Yorkshire in 1905, the children run through the field and stand at the gate to wave to the train. There is a vapor trail in the sky.
When the children are walking along the railway line it clearly has modern concrete sleepers which were not used in 1905.
When Mr Szczepansky ('the Russian') is boarding the train for London, after his family have been found, a car/vehicle is very clearly visible driving past in the top left hand side of the frame.
As the locomotive approaches Bobbie in the 'landslide sequence', modern overhead power-lines are visible. The film is set in 1905
The rail-level shot of the train approaching the children in the 'landslide sequence' is a different location to the remainder of the scene, having been shot at the northern portal of the Keighley & Worth Valley Railway's Mytholmes Tunnel, with the parapets of Mytholmes viaduct visible in the middle-distance - the remainder of the scene was filmed several hundred yards further along the line in visibly different surroundings.