The German commander addresses the British officer as Major Mace which is correct, however several times in the movie he also calls him Captain Mace.
Aside from the military uniforms, all clothing worn by both the cast and the extras is current fashion, circa early 1960s; Mia Massini's hair styles are strictly 1964.
At c.25 minutes there is a short close-up of the baby breast-feeding. However the mother's shirt is a different colour and design from the other shots.