Factual error: When Fleming salutes Cholmondeley and Montague, they return the compliment whilst not wearing their headdress. Members of the British armed forces never salute if they are not wearing a hat, instead they would stand to attention.
Factual error: All the Royal Naval Volunteer Reserve officers appear to wear green branch distinction cloth ('lights') between their rank rings. Green indicated electrical officers. As non-specialist officers, they shouldn't be wearing any lights at all.