Revealing mistake: When the historic "Mahna Mahna" sequence in the sauna ends, the girls come out of the building running through falling snow in all their youthful bounciness. The "snow" comes from the left, at a rather extreme angle; if it were real snow there would be an awful icy wind blowing, but the girls' hair is mostly unperturbed, and in the shots that follow there's no snow at all. It's obvious that this snow is just coming from a fan kept off frame. (00:51:15)
Revealing mistake: At the beginning of the opening title sequence if you look behind Silence as he rides through the snow covered forest you can see what looks like a couple of skiers whizz by. (00:05:34)
Continuity mistake: When Gregor and Willie are attacked by the German convoy, they pick up two discarded StG 44s, but in th next scene they are firing AK-47s which had not yet been invented. After the battle, they are again carrying StG 44s.
Factual error: When Premier Kamenev shows Kiril a map over the Chinese-Soviet border, it shows the Korean peninsula as a part of China.
Revealing mistake: When Buck and the gang ride away from the saloon in Dallas where JC made a few new 'friends', the footage is sped-up for a second just as soon as James Caan jumps on his horse. (00:05:50)