Other mistake: When Hudson is briefing the girls' football team he calls Mel Sarah, mixing up the character name (Mel) and actress (Sarah Lawrence).
Continuity mistake: Leah and Shannon are in the computer room - Mr Malachy comes in and talks to Leah, Leah's hair is loose. The angle changes when Malachy leaves the room and Leah's hair is now neatly tucked behind her ear.
Continuity mistake: When Hudson is setting up the equipment for the sports day Shannon jumps on the mattress in front of him and her jumper lifts up, exposing her midriff. When the angle switches to behind Hudson, Shannon's jumper is tucked in to her jeans and her legs have also changed position.
Factual error: Shannon asks Leah if she knows what happened to Tom Smith - she replies that Tom has gone to university, but in the previous series Tom was only in his first year of sixth form, and it takes at least two years in the sixth form to study for the A levels required for a university place.
Suggested correction: Although normally A-levels are taken after 2 years, it is possible (and often done) to study them in one year.
Continuity mistake: Tanya and Karen Young are step sisters. In this series Tanya says her family came about by her father marrying Karen's mother, but in later series it had changed round, with Karen's dad marrying Tanya's mum.