The box that Tiffin makes for Captain Oliver Woodward, as shown in the movie, was the actual box that was made in the trenches during the war. The Woodward family still has this box and gave the cast and crew permission to use it for the film.
At the church scene, all the soldiers are wearing service medals for the Great War (British War Medal and Victory Medal). Woodward and McBride are also wearing gallantry decorations of the Military Cross (purple and white riband). Sergeant Fraser is also wearing a Distinguished Conduct Medal (this is regarded as the level below the highest medal for gallantry, the Victoria Cross). One soldier is wearing a 1914-15 Star, indicating a longer period of service.