Several shots of tanks appear in the film, both Mark V (Mark Five) and Mark V* (Mark Five Star). They have been colourised green. In reality, tanks of these types were painted "a neutral brown colour". See the article by the British Tank Museum which states that. "Surrendering to the inevitable, towards the end of 1916 it was ordered that the tanks should be painted in a 'neutral brown colour' all over." These tanks entered service in 1918, and were factory-painted brown.