Continuity mistake: As the six pupils who visit the closed down Brookdale school find an unlocked door to enter Fay, Jackie and Banksie are the last three of the group in that order, but when the angle changes Banksie is ahead of Jackie and Fay, who have swapped places.
Episode #8.8 - S8-E8
Visible crew/equipment: When Ronnie is asking Calley if she has seen her missing coat, there is a boom mike shadow on the wall behind them.
Episode #8.4 - S8-E4
Visible crew/equipment: In the music room when Kevin warns Larry not to mess with Emma Stebson, there is a shadow of the mike on the cupboard behind Kevin.
Episode #7.3 - S7-E3
Other mistake: Jeremy is making a copy of Zammo's bus pass - the expiry date on it is 16th December 1983, this series is set in 1984.
Instruments - S5-E5
Visible crew/equipment: In the music lesson when Miss Griffiths restarts the pupils playing the music after Roland has returned to his seat, on the right hand side of the screen a crew member's hand can be seen signalling a cue for the music to start.
Episode #7.5 - S7-E5
Continuity mistake: In this episode Miss Lexington's first name is Jenny, in previous series' it was Andrea.
Plot hole: Chrissy is pushing her baby Jay in her pram into the school playground. Justine and Luke call out to her from an upstairs window, then come out to meet Chrissy. They come down from an upstairs floor to the playground in five seconds, which is not enough time.
Factual error: Justine and Maria are in Justine's bedroom. Justine is showing Maria the photos on her bedroom wall of her family and school friends. There is a photo of Banksie and Zammo on the wall. These two boys left Grange Hill at the end of series 10. Justine started in series 11, so she would not have known them.
Plot hole: Gripper, Woody, and Randir are suspended from school for two weeks after their involvement in the fight. Woody and Randir appear in the next episode, but Gripper doesn't return until episode 14.
Character mistake: Gripper tells Georgie that he and Denny are bunking off their next lesson to go to the cafe, but they do actually go to their next lesson where they find Randir writing on the blackboard.
Episode #7.2 - S7-E2
Other mistake: When Claire is asking her friends for their dates of birth for her bio rhythm calculator Anita says her date of birth is 25th October 1968, to be in this school year she would have to have been born between September 1967 and August 1968.
Other mistake: Hollo goes into the hall where Perry is with Louise, Cheryl and Julie after Hollo has taken Perry's money for the bet he says "hope you win, Perry". Hollo couldn't know his name when he hadn't met Perry before or been introduced to him.
Visible crew/equipment: When Mrs McCluskey parks in the school car park camera's and crew members are reflected in the side of her car.
