Continuity mistake: The students action group (SAG) led by Jessica Samuels protests on the sports field during the cricket practice. Mr. Baxter tells them to move and they ignore him, Baxter then says "I've no intention of telling you twice" and they all walk off. The angle changes and Jessica is standing alone - all the kids that were standing around her have disappeared. Jessica was looking to her left as the kids walk off, then to her right at Baxter, then turns to her left to walk off. Another angle change and Jessica is looking to her left before turning to her left and walking off for a second time.
Continuity mistake: Mr Mitchell and Carol are in the back seat of the police car looking for Trisha, and when they see her walking home alone they stop to pick her up. In the following scenes of the police car speeding through the streets you can see that Trisha is not in the car, only Carol and Mitchell are in the back seat, but when the police car stops to arrest the man who is following Cathy, Trisha is there again.
Continuity mistake: When Carol meets Trisha at home time at the school's main entrance, behind them you can see two cars parked in front of the school - a black Humber facing the school and a red Vauxhall Victor. When the shot changes to Cathy standing outside the school's front gate you can see the red Victor has gone, the Humber is now parked in the same place but facing away from the school, and a white VW camper has appeared next to it.