Continuity mistake: Michael Doyle is sitting on the back seat of the coach between Alan and Andrew, when he plays the prank on Penny Mr. Mitchell moves him to a front seat, but when the coach stops to let Justin off when he feels sick, Doyle is back between Alan and Andrew.
Visible crew/equipment: After picking up Harriet from the stables the camera, boom mike and some crew members can be seen reflected in the side of Mr. Griffiths' van after he shuts the driver's door.
Visible crew/equipment: There is a boom mike shadow on the wall behind Tommy when Alan says he has stopped smoking and started eating sweets instead.
Visible crew/equipment: A boom mike shadow can be seen on the wall behind Cathy when Miss Peterson wants a word with her.
Visible crew/equipment: There is a boom mike shadow on the wall behind Mrs. McClusky at the PTA meeting.
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.
Visible crew/equipment: There is a boom mike shadow on Mr. Keating's desk when he is talking to Mrs. Carrington.
Visible crew/equipment: Boom mike shadows can be seen in this episode on Andrew's face as the class comes in for registration and on the walls of the woodwork room storeroom when Tucker and Doyle are in there.
Visible crew/equipment: The boom mike is reflected in the front window of the house when Benny jumps over the wall during his paper round.
Episode #3.8 - S3-E8
Visible crew/equipment: A boom mike shadow is on the wall during cookery when Tracey puts the chocolate in the wrong pot.
Episode #3.9 - S3-E9
Visible crew/equipment: There is a boom mike shadow on the wall behind the trading post when Mr. Sutcliffe and the pupils are setting it up.
Episode #3.7 - S3-E7
Visible crew/equipment: A boom mike shadow is seen several times during Miss Peterson's registration period.
Episode #3.5 - S3-E5
Visible crew/equipment: There is a boom mike shadow seen several times in Mrs. Thomas' class when she is asking the class to collect insects.
Episode #3.3 - S3-E3
Visible crew/equipment: When everyone stands up to get off the coach there is a boom mike shadow on the back of the boy in the blue jacket.
Episode #3.2 - S3-E2
Visible crew/equipment: A boom mike shadow is on Miss Mooney's desk just before Mr. Curtis enters the room.
Continuity mistake: In some episodes Grange Hill has its own on site swimming pool but in others it hasn't, and the pupils have to go to the local leisure centre.
Visible crew/equipment: When Maddie's mother Suzy arrives at school, you can see a boom mike shadow on her shirt.
Continuity mistake: Tarquin and Forbes arrive at school in Tarquin's sports car. The car keeps disappearing and reappearing during later shots of the car park.
Continuity mistake: In the panic when the hall is evacuated for the bomb alert, Sammy's tiara is knocked off, the angle changes and it is back on her head. Then when the pupils are allowed back in, Sammy and Alex are the first pupils back in the hall - Alex picks the tiara up off the floor and places it on Sammy's head.
Continuity mistake: When Matt is in his hospital bed talking to Cracker, the position of Matt's head changes between shots.
