Continuity mistake: When the stairs are first shown, there's carpet up the middle of the stairs. At the end when they flee the house it's gone.
Continuity mistake: Colour Sergeant Williams and Private Storey are miscredited as "Company Sergeant Major Williams" and "Corporal Storey." Neither is promoted over the course of the film, and both are not only addressed as "Colour Sergeant" and "Private," respectively, but also bear the rank insignia of a Colour Sergeant and a Private, respectively.