Factual error: When first introduced to the Poles' training flight and they break stating "repeat please", the front 2 aircraft are Hurricanes but the 3 remaining aircraft are the stand in 109's. If you look closely you can see the rear wing struts to the fuselage.
Character mistake: Many windows only have 1 or 2 panes taped over to prevent glass from shattering when it's hit. Unless every pane is taped over this will achieve next to nothing.
Revealing mistake: In the opening scene when the Hurricanes take off from the makeshift airstrip in France, well established earth-banked aircraft pens can be seen in the background. This indicates that the Hurricanes took off from a well established military airfield.
Continuity mistake: When the Senior Civil Servant is reading Dowding's letter there is a knock at his door. In the next frame the Civil Servant has removed his glasses, appears more leaned back in his chair, and the position of the letter/page has also changed. (00:06:00)
Continuity mistake: When Schmidt interrupts and delivers a report to a Luftwaffe meeting, the presenter is holding a wooden stick used for pointing on the table map. When Schmidt enters the room with the camera facing towards the door, the presenter puts his two hands at the top of the stick, supporting with his palms. Just before the next shot watch carefully and you will see both hands move off the stick. In the next shot with the camera now facing towards the table, the presenter has his left palm resting on the back of his right hand with the right palm supporting the stick. (00:51:35)
Continuity mistake: At the start of the movie in the airfield in France, in the scene where the camera is behind the French soldier talking on the phone, another soldier stands at his left side. In the next shot the nearby soldier leans closer to the telephone operator. (00:02:15)
