There are a couple of scenes and moments in the film that do not feature in the original English version, most notably Mason's dog, Kitty, as well as his encounter with the chicken, and the scene in which the enlisted men are chosen to take part in the raid. These may have been added purely for comedic relief/furthering the plot, or may have featured in R.C. Sherriff's less successful novelised version of his play.
Exists but current version is missing approx 10 mins.