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.
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