AA sign "Titchfield" shown, when all location signs were destroyed to confuse the enemy if invasion occured.
The Anson comes in to attack and bombs the German sub. It then comes round for another bombing run and amazingly, the bomb racks have re-loaded.
In the final scene Rick still apparently has his left arm in a sling. This would make it rather difficult - or rather near-impossible - for him to change gear in the car he is driving, a right-hand-drive Lagonda.