The film portrays events leading up to the events of D-Day, yet the aircraft parachuting the girls into France displays invasion stripes, which were painted onto aircraft at the time of the D-Day landings to ease recognition of Allied aircraft.
The basic premise of this film is that a Geologist has been sent to France to study the sand on the beach is incorrect. Frogmen landed at night on the beach to take samples and were then taken back immediately to England. There is no possibility of any access being gained to the beach by a civilian as they were heavily guarded.
The scene in Holloway prison where the murderess is recruited to the mission, shows her looking out onto a courtyard were a scaffold is erected. Hangings in Britain by this time were conducted indoors in a room adjacent to the condemned cell. Prisoners were not aware of where the gallows was in order to spare them anxiety.