Factual error: When the bombs are being taken down the lane, in the background where the lane meets the road a white mini can be seen passing the entrance.
Other mistake: A lot of the aircrew are wearing a 1939-45 Star medal ribbon. This medal was obviously issued after the war's end.
Plot hole: The factory in Norway has to be destroyed - at huge cost - as it is producing fuel for the V2 rocket. That fuel was ethanol - ordinary industrial alcohol. There is no reason at all to have a specialised factory hundreds of kilometers away producing such a simple chemical. The Germans could have manufactured it in virtually unlimited quantity in an ordinary brewery - and there were plenty of those in Germany.
Factual error: The dialogue refers to "Earthquake bombs" The real earthquake bomb, Barnes Wallace's Grand Slam weighed 10 tons and was designed to penetrate deep into the ground, shaking structures above. Even that would be unlikely to have an effect in the posed scenario.
Revealing mistake: In one shot, approximately just at the beginning of the actual attack, it shows a Mossie banking hard left at about 80° - the view is from the front. From the left wingtip, a "line" is shown continuing the dihedral angle to the edge of the frame. This is obviously a pair of control lines - so indicates it is a model being flown.
Answer: He says "You can't kill a squadron".
Bishop73