Factual error: When Wood's character and the gang go to the match which is supposed to be between West Ham United and Birmingham City the teams we actually see in the football action shots are West Ham United and Gillingham.
Factual error: Before the trip to Manchester, we see Charlie Hunham and Elijah Wood outside King's Cross station (London's station for trains to the North East & Scotland) with a GNER train in the background. In the next scene, they are shown inside Paddington station (London's station for trains to South Wales, Devon & Cornwall) catching a First Great Western train. The next scene shows a shot of a Silverlink County train, which run from London Euston to Northampton and Birmingham. In these three consecutive scenes we are shown 3 different trains, run by 3 different operators, none of which actually serve Manchester.