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.
Factual error: In one scene, Nancy gives Sid his trademark chain/padlock necklace. That item was actually given to him by The Pretenders front woman Crissie Hynde.
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.
Factual error: In the USA at the time the Pistols split (Feb '78) you see Sid crashing through a hotel window, there is a woman wearing a Joy Division Unknown Pleasures T-shirt. This album didn't come out until June 79, 4 months after Sid's death.