The Making of Private Pike - S9-E2
Continuity mistake: In this episode, Captain Mainwaring was given a new staff car. However, he already has one from S7 E5, The Captain's Car. What happened to the previous one is never explained, and surely he would not lose all reluctance to accept the job if he already had a staff car?
Visible crew/equipment: Towards the end of the episode where Godfrey goes back into the smoke filled hut to rescue Captain Mainwaring, the shadow of the camera is visible on the hut.
The Making of Private Pike - S9-E2
Factual error: When Private Pike is on parade and keeps looking at his watch so he is not late for his date at the cinema, the watch is too modern for the period.
Other mistake: Walker is attempting to steal items from the farm but appears on the training activity with the other troops at the same time.
Answer: The show is a comedy, this was played for comedic effect and to show that in times of extreme fear, in this case about to be crushed by a steam train, the men had an adrenaline surge strong enough to pedal fast enough.