Continuity mistake: Mr McGuffy is walking down the corridor - behind him is a girl dressed in pink, and walking towards him is a boy in a black jumper with a white stripe on it. Mr. McGuffy enters the classroom to speak to Pogo - when the angle changes to inside, the girl in pink doesn't walk past the open door but the boy does, even though he had already passed the door in the previous angle.
Continuity mistake: In the first scene of the disco with Glenroy as the DJ, some of the kids dancing can also be seen in the next shot of kids waiting in the queue to pay to get in.
Continuity mistake: In the second scene in the school corridor two girls are walking in front of Alan and Tucker, one wearing a black skirt and a black and white top and the other wearing a blazer and a black skirt. They walk up the stairs as Alan and Tucker stop and chat, a few moments later the same two girls are now behind Alan and Tucker and walk past them in the corridor.
Continuity mistake: Doyle's mate Robo's full name is Robertson in this series, but in series one it was Robinson.
Episode #4.2 - S4-E2
Character mistake: In the meeting, Susi says that Penny Lewis and Rosie Spencer got in trouble during the previous year for writing a libelous article in the school magazine about Micky Doyle, but it was actually Penny and Chris Dukeson that got into trouble about that article about Doyle.
Episode #3.9 - S3-E9
Visible crew/equipment: When Pogo gets out of his father's car there is a reflection of a sound man holding a boom mike in the car window.
Episode #3.1 - S3-E1
Revealing mistake: Karen Stanton supposedly hits Michael Doyle in his nether region with her satchel but she actually hits him below the knees.
Continuity mistake: While they are lost in the forest, Penny and Suzi fall in a pond, soaking their clothes, but in following shots their clothes have dried really quickly.
Continuity mistake: When Mr Styles is telling everyone the hostel's rules, Penny's head moves between angle changes from leaning over to her left, then upright, then leaning over to her right.
Episode #2.3 - S2-E3
Visible crew/equipment: There is a boom mike shadow on the wall behind Penny when she and Susi are laughing at Antoni who has fallen asleep in class.
Other mistake: All throughout this series Grange Hill is celebrating 125 years on the same site, but Grange Hill didn't move to this site until series eight in 1985, when the school merged with Rodney Bennett and Brookdale schools, this being the former Rodney Bennett site.
Visible crew/equipment: Boom mike shadows can be seen on the walls of the gym when Jacko is talking to Mr Robson.
Visible crew/equipment: During the yoga sequence in the gym when Mr Robson goes to speak to Brian and Neil, the shadow of the camera can be seen on the backs of the two boys in the back row.
Revealing mistake: When Ted and Mauler are walking down the shopping street you can see a young girl standing behind them waving at the camera.
Continuity mistake: In the final scene when Lucy Pearson is in bed holding a soft toy, the position of her arms around the toy change between shots.
Visible crew/equipment: When Mike gets into his father's car the boom mike is reflected in the window as he shuts the door.
Continuity mistake: Ronnie arrives at school on her moped and parks next to a blue car that Vince is hiding behind - she removes her helmet, the camera cuts to Ziggy shouting at Vince, and when the camera cuts back to Vince, Ronnie takes her helmet off a second time.
Visible crew/equipment: Early in this episode, when the pupils are coming into school, Calley calls out to Vince "oi Vince, there's a lot of people looking for you" there is a reflection of a sound man holding a boom mike in the window of the blue car next to Vince.
Visible crew/equipment: Just after Calley goes into the dentist, Ronnie and Fiona walk past a shop window that the camera and crew are reflected in.
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.
