Nelson and Chief go down in the Bell but swim back with the Baron in Modern diving gear. Bell never went back to the Seaview.
The missiles that are ready to launch from the German submarine all have fins and German WWII-era markings. But when one of these missiles is launched it is seen emerging from the water with no fins and the name "Polaris" displayed on its side.
Crane mistakenly refers to an Iron Cross as a Swastika.
(At around 22:00 mins) The shadow of a boom mic is visible above the two Nazis in the missile room.
(At around 22:00) The shadow of a boom mike is visible above the two Nazis in the missile room.
As is common with this series, this episode is riddled with firearm errors. The .45 caliber 1911 pistols carried by the crew and villains are often de-cocked and unready to fire, or else have their slides locked back, indicating they are empty.
As is common with this series, this episode is riddled with firearm errors. The .45 caliber 1911 pistols carried by the crew and villains are often decocked and unready to fire, or else have their slides locked back, indicating they are empty.