Continuity mistake: When the engineer shuts down the train he's wearing a long sleeve jacket, but in the closeup we see a bare arm wearing a watch. The terrorists remove that engineer and he's replaced with McGivers, another engineer wearing a jacket, and the same bare arm is in closeups. Then a third engineer on another train has the same arm in the closeup. (00:06:40)
The Four Tasks of Danger Mouse - S2-E6
Continuity mistake: When Danger Mouse sets off to rescue Penfold in his car in Part 1 at the beginning, Penfold is in the car in some scenes, although he was kidnapped by Baron Greenback.
Suggested correction: That's his identical twin brother Pendragon, hired by DM so people won't think he had abandoned his trusty sidekick to the dastardly Baron Greenback.