Goofs

During the song "Bombed Last Night" in the trench that had just undergone a gassing disaster, when the sergeant is doing his dance, he is just turning clockwise on 'no more of us'. However, in the next frame, he is suddenly facing the absolute opposite way with no time in between shots for him to have turned around that quickly.

Sir Edward Grey (Ralph Richardson) is shown early in the film being accompanied by his wife, described in the credits as Lady Pamela Grey. In fact, Grey did not marry Pamela (nee Wyndham, and the widow of Lord Glenconer) until 1922.

When the Battle of the Somme is being written off, the staff officer states 'Ground gained - nil.' In actual fact, as a result of the Battle of the Somme the German army retreated to the Hindenburg Line, a distance of 10 - 25 miles over a front of 70 miles. A considerable amount of ground gained.

The sign at the end of the pier was "World War One". The 1914-18 war was known as "The Great War" until 1939.

The bayonets of the Band of the Irish Guards as they parade down the Brighton promenade appear to be for the L1A1 self loading rifle, first issued 1957 and still issued as standard by the time of the film, rather than the correct 1907 pattern bayonet for the Lee-Enfield No1 mkIII rifle (characterised by its longer blade length of 17" as opposed to the 8" of the L1A1's bayonet).

In one scene set in 1916, a British character refers to rationing. In fact, rationing wasn't introduced in the United Kingdom until February 1918.

On the morning of the Christmas Truce, when one of the soldiers is offered a hot drink, he doesn't move his lips when he says "cocoa".

When Sir John's car drives off after his conversation with Harry, a modern car can be seen reflected in the window.

Towards the end of the film, a group of Scottish soldiers wait in a trench for an attack to begin. The weather is unsettled and the film crew's reflections are visible in the soldiers' wet helmets.