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 #4.4 - 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
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 #4.6 - 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
Continuity mistake: Just before Gerry, Ruth and Cathy go into the toilets Cathy is standing on the left - the angle changes and Cathy is now standing between Ruth and Gerry. Later on when they ask to go outside to get away from the puddles the three girls are standing close together, the angle changes and they are standing further apart.
Episode #4.6 - S4-E6
Continuity mistake: When Booga Benson attacks Tucker on the stairs, Booga grabs Tucker's hair with his left hand, but the next shot shows him with his hand on Tucker's jacket.
Episode #4.6 - S4-E6
Continuity mistake: When Mr Thomson comes into the hall to tell Mr Sutcliffe that the dance is cancelled, Mr Thomson puts his hands behind his back twice between shots.
Episode #4.9 - S4-E9
Continuity mistake: In the final scene when Miss Peterson is having a private word with Cathy about her attitude, the classroom door closes by itself.
Continuity mistake: When the pupils are boarding the coach the weather is dry and sunny, but as soon as the coach drives off the ground is wet and the weather dull.
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: Mrs McCluskey tells Gripper he is suspended until the end of term but he appears in the next episode.
Continuity mistake: Pogo throws the chair at Gripper legs first but when it goes through the window it has turned round as the chair backrest hits the glass.
