Continuity mistake: The location of Mrs McClusky's office in the school changes during this series.
Continuity mistake: Doyle's mate Robo's full name is Robertson in this series, but in series one it was Robinson.
Continuity mistake: Mrs McClusky's first name is Brigit, but the sign on her office door says Mrs. M McCluskey.
Episode #4.1 - S4-E1
Continuity mistake: The fire alarm sounds and the school is evacuated, three shots are shown of pupils running down the same staircase - in every shot it is the same pupils descending the stairs three times.
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 #4.2 - S4-E2
Visible crew/equipment: There is a lighting rig reflected in the door windows when Mr. Thomson tells Tucker, Alan and Tommy to get out.
Episode #4.3 - S4-E3
Visible crew/equipment: A boom mike shadow can be seen in the kitchen when Clare is talking to her mum.
Episode #4.3 - S4-E3
Visible crew/equipment: There is a boom mike shadow visible during Miss Peterson's registration.
Episode #4.4 - S4-E4
Continuity mistake: When Mr Hicks says "Move it, Stewart!" when Stewpot is climbing a vaulting box, Hicks is holding a basketball and his arm is stretched out, but when we see Hicks in the next shot, his arm is now by his side.
Episode #4.4 - S4-E4
Continuity mistake: When Mr Hicks says "I said I didn't want to see these rags again, Marks", you can see that there is nothing behind Marks, but in the next shot a white shirt is behind him.
Episode #4.4 - S4-E4
Revealing mistake: When Mr. Baxter punches Mr. Hicks you can see that Baxter's fist passes in front of Mr. Hicks face and dosen't actually hit him. Also Hicks' reaction is too late, and his head moves after Baxter's fist has passed him.
Episode #4.4 - S4-E4
Audio problem: When Mr Baxter punches Mr Hicks in the sports hall, a punch sound can be heard before Mr Baxter's hand makes contact with Mr Hicks' face.
Episode #4.4 - S4-E4
Continuity mistake: When we see the pupils jumping the pommel horse during the PE lesson, Gripper does his jump and you can see there is a pupil with a dark blue shirt at the back of the queue, but when we see a close-up of the queue in the next shot, there is now a pupil with a light blue shirt at the back. Then when Richard Marks does his jump over the horse the pupil in the light blue shirt has disappeared.
Episode #4.4 - S4-E4
Continuity mistake: When the shopkeeper bans the two Grange Hill pupils from going into the newsagent, Pogo, Stewpot and Duane can be seen walking towards the shop, but in the next shot they are back in their original positions.
Episode #4.5 - S4-E5
Visible crew/equipment: A boom mike shadow can be seen in the library when Suzi sits with Tucker.
Episode #4.5 - S4-E5
Visible crew/equipment: A boom mike shadow can be seen in the library when Mr. Thomson tells Tucker to leave.
Episode #4.6 - S4-E6
Continuity mistake: When Mr Sutcliffe asks Tucker if he knew who was responsible for the vandalism, Tucker's jacket is only on his left shoulder. In the next shot, Tucker now has the jacket fully on.
Episode #4.6 - S4-E6
Continuity mistake: Tucker, Benny and Alan are in the hall for Mrs McClusky to announce the winner of The Competition to design the front cover of the school magazine. The shots alternate between Tucker and co and Mrs McClusky - every time the camera is on Tucker, Benny and Alan there are different people standing in front of them.
Episode #4.6 - S4-E6
Visible crew/equipment: A boom mike shadow can be seen on Pogo's head during registration.
Episode #4.6 - S4-E6
Visible crew/equipment: There is a boom mike reflected in the door window when Alan stops Tucker from going after Booga.
