Continuity mistake: Near the end, when Lucy tries to get into the building, she is blocked by police officers holding clubs straight ahead in front of them. The scene cuts to a roof shot, then back again, and Lucy tries again, but the clubs are missing, the cops just have their hands out in front of them.
Revealing mistake: Although set in the 1960's, the school bus lettering was Arial, a font not invented until 1983.
Factual error: After Jude gets arrested and comes back to Liverpool the shot of him walking across a bridge shows a train in the background. The train network in Liverpool wasn't established until the 1970's, and regardless, the train shown is a modern train which started to be used in about 2005.
Factual error: Although set in the 1960's, a modern UPS truck is seen just before the rooftop concert scene.