"No German flew an all-red triplane except the Red Baron, and it was red with a white cowling," he grumbled. "And even then, Richthofen mostly flew planes that weren't all-red."
He wants to go see the flick anyway, and as his long-suffering wife, I will sit beside him and listen to him gripe about all the historical innacuries with regard to the planes and their markings! *sigh*
LOL!
That was an intentional inaccuracy. They wanted to make it easy for viewers to tell the German planes from the French planes.