Other mistake: Wilson picks up the empty tablet bottle, but we hear the tablets rattling inside. Wilson then says 'it's empty, sir.'
Visible crew/equipment: Bank scene: As Pike is handing the mail to Mr Mainwaring, a boom microphone is visible at the top of the screen for a second, and is quickly removed from view. (00:09:10)
Continuity mistake: At the end when they line up for The Royal Train to pass there are six platoon members amongst those present, Private Frazer is not one of them. However, after the train passes and they are shown wet in head shots, he is present. As the camera pans out, we are back to the original six.
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.