When the security returns to his vehicle after investigating the alarm; he starts to open the passenger door. However in the next immediate cut; he is opening the driver's side door and then goes in.
When the security vehicle departs after responding to the alarm; there is a can on the sidewalk next to a pole. However, the can was not there before the vehicle pulled up and the driver exited the vehicle without anything in his hand except for a flashlight.
When inside the car Carl (Paul Whitehouse) and Danny (Ray Winstone) are talking to each other. Carl is shown throwing a cigarette butt out the window before closing it. There's audio supporting this. When the camera changes angle from behind Carl, the window can be seen to be open again.
Charlie is seen taking trips to and from Kent on HS1. In one shot the train changes from high speed overhead operation to third rail slower main line operation, then immediately afterwards changes back to HS1 track.
Footage of a Javelin high speed train passing cliffs has an announcement saying the train calls at Stratford, Canterbury West, Dover and Margate. The first port of call is Stratford International then regular HS1 services will call at Ebbsfleet and some at Ashford International stations afterwards. While they do indeed go to Canterbury, Dover is not served by SE High Speed, and was not at the time the film is set (2015).
Kenny continues sleeping while the alarm goes off and Basil calls out to him through the walkie-talkie. However when Basil opens the door to the lookout room where Kenny is stationed; he easily wakes up although the noise of an opening door is much smaller relatively speaking.
Several times in the film, Kenny's mouth does not move when he is saying a line. For instance, when he is in the pub and is offered a double shot of vodka, "Why not?" is heard, but it is clearly ADR (Automated Dialogue Replacement).