Continuity mistake: When Will says "Sir." to Mr Gilbert in the pub (after Gilbert says "I'll make sure you get another badge for this"), a man in grey trousers and a blue jacket can be seen standing inside the pub at the top left of the screen. Not only is everyone supposed to have left the pub at this point, but he wasn't visible in the previous identical shot of Will. (00:19:51)
Continuity mistake: When the boys are on the Nemesis Inferno, Will sits at the front while the rest sit behind him, and this leaves the right outside seat free. However, when the roller coaster is moving, the mounted camera shows that Simon, Jay and Neil have all moved one seat to the right, meaning that Simon is now on the right outside seat instead of it being free. (00:18:45 - 00:19:35)
Factual error: About halfway through the scene of the boys riding the Nemesis Inferno, the coaster train speeds through an inverted 360 degree loop. In actual fact, this loop occurs right at the beginning of the ride, whereas this scene makes it appear to occur near the end. (00:19:20)
Continuity mistake: The timing throughout this episode is bizarre. The boys leave their town in broad daylight, but by the time they get to London, it's dark. As they leave, Will's VO says they were in the club for 25 minutes, and Simon then says it's 1am, so they would have entered the club at 12:30am. Earlier, Simon said they had spent an hour looking for a parking space, so they started searching at 11:30pm. So how could they take so long to drive into London that it was broad light when they left but 11:30pm by the time they arrived? Even if they were lost in London for several hours, it would have gotten dark while they were lost, not been dark when they already arrived. This is even stranger if you consider that in the books and backstory, the boys' school is in a London suburb.
Deliberate mistake: In the scene where Jay spots the "car full o' muff" and they follow the car until it turns left (just after Jay says he'd "give a left bollock for em"), when it pulls away, the shot is flipped. The number plate is reversed, all of the logos on the back of the car are backwards, and the car is actually turning right, as it heads to the right hand side of the road. The shot is just flipped to make it look like they're turning left. (00:10:50)
Continuity mistake: When Jay first shouts "Bus Wankers" from Simon's car, the people at the bus stop change between shots, as does the weather. On the first viewing of the stop as we approach it, there are five people around it and it is sunny. On the shot going past the stop there are now six people at the stop. Also the weather in the second shot is now overcast and sunless. Also in the next shot of the boys laughing to Jay's outburst, there is no sign of the bus stop they've just past but in the car's interior shots you can see the Bus Stop road markings through the rear window.