Revealing mistake: After the soldiers execute their spiritual comrade, Jim takes cover in the field of dead bodies nearby as the executioners run off to search for him. The body right in front of Jim is breathing, as his chest is moving up and down. (01:22:45)
Revealing mistake: When Jim is walking across the Westminster bridge and shouts "Hello?" for the first time, in the next shot you can see a blob on the bridge (right of picture). This is all that's left of a car going across the bridge, that wasn't painted out completely.