At the tour greeting reception, Bull has his cigar in the center of his mouth as he walks across to the tour guide, but in the shot as he sits down, it suddenly jumps to being on the right side of his mouth.
Starting at 25:16 as Magnum and Floyd are driving towards the city, following the shooting, it's obviously not Magnum nor Floyd in the car. 'Magnum' has no moustache and Floyd has black hair.
The British Army simply would not have an aristocrat as an NCO. It would never have one as an RSM and the rank and file would be equally bewildered by a posh bloke in the position similar to the role of drill sergeant in the USMC- a loud, brutal individual kicking recruits into shape. Also, Brits do not practice the American name and number thing- 'Jonathan Quayle Giggins III' is just not found in Britain.