Goofs

When Jason first meets Judy on the train, he sits diagonally opposite her, so logically one of them should be travelling backwards: however, when the camera switches between the two, the scenery outside the train moves backwards for both of them.

Robin Askwith boards a 4SUB EMU at Waterloo station, a purely suburban train originally built by the Southern Railway.. Once on the train and meeting Vanessa Shaw it has morphed into a BR Mk1 compartment carriage. A later exterior shot depicts a hauled train, powered by a Class 52 Western diesel loco. A further exterior shot shows another train, this time powered by a BR Class 40 diesel. Finally, on arrival, the train has become a 2 car EMU.

Having been told that the Manor is 2 miles away Jason and the girl start walking and are caught in heavy rain. 2 motor cyclists pick them up and drop them at the manor by which time the rain has stopped but there's no sign of puddles and everyone is dry.

At the start when Jason gets on the train it's an electric Southern Region of at least 4 or 5 carriages. During the journey there are a number of shots of the train which is now a Deltic type diesel. When Jason gets off without having changed trains it's become a 2 carriage electric unit.

There are initially two straws in the green drink on the breakfast tray brought in by Frederick. However, these soon change to just one, in a different position, when Dr Storm comes into Judy's room.

In the cell Jason tells Abraham 'the dwarf usually brings the food in' He can't possibly know that as he's only been in the cell a short time most of which he was unconcious through being gassed.