The grenade used by Josee is a modern M67 fragmentation grenade. An appropriate grenade for the period would have been a British No. 36 "Mills Bomb".
The grenade used to kill the German officers is a M67 which wouldn't exist until 1968.
It beggars belief that after every mission in occupied Europe the team are flown across the Atlantic back to Canada rather than debriefed in the UK.
Colonel Sinclair's ribbons have been sewn on upside down. As a result, the medals they represent (British War Medal, Victory Medal, King George V Silver Jubilee Medal and King George VI Coronation Medal) are in reverse order.
Lieutenant-Colonel George Mayhew (the British officer in an early scene) is shown with Lieutenant's rank.