Continuity mistake: Early on Nancy is in a limo and a man with long hair tells her to get drugs. While he's talking his hand goes from resting on his chin to resting on the armrest instantly.
Factual error: When Nancy goes in a car in London to score drugs there is a political poster stating 'Labour Isn't Working'. This poster was used by the Conservative party in the 1979 general election - Nancy was killed 9 months prior to this election.
Continuity mistake: When the Sex Pistols are playing in California there's a shot from behind the bar showing that the guitar player wearing a red jacket is to the right of Johnny Rotten. Then the view goes closer and the guitarist is at his left.