After dropping its bombs the plane starts heading for home when its hit by anti aircraft fire and one one of the engines is hit but soon after a shot of the plane shows that both propellors are turning.
When they are escaping with the help of Jo de Vries, she tells them to look out for a boat with 2 white diamonds on the starboard side, but when seen they are on the port side. If the diamonds are on both sides why did Jo mention the starboard side?
At the very start of the film a list is shown of the five Dutch nationals who were executed for aiding the British airmen. The first name in the list is shown as "Arie van Steenset". This is a typo. His name was actually "Arie van Steensel".
The bomber crew bail out at such long intervals that they would have landed miles apart, making it impossible for them to find one another on the ground.
Even though they are British actors, the crew uses the word 'railroad' several times. 'Railway' is the common British term.
It seems unlikely that the sentry who starts shooting at the escapees from the bridge would not sound an alarm that would summon a patrol boat that could easily catch six men in a rowboat headed out to sea.