Revealing mistake: Carlene makes Joanna a cup of coffee in the common room after finding her drunk in the toilet. Joanna refuses to drink it and drops the cup, breaking it - it's obvious that there was never any coffee in the cup.
Grange Hill (1978)
1 revealing mistake in season 20 - chronological order
Starring: Gwyneth Powell, Lee Cornes, Sally Geoghegan, Stuart Organ
Genres: Family
Episode #2.8 - S2-E8
Audio problem: When Cathy and Trisha are walking to the post office with Mr Hargreaves walking behind them their mouths are not moving in sync with their dialogue. (00:09:55)
Mr Baxter: racism, bullying.extortion, I should think that's enough to have you slung out of this school for good six times over.
Trivia: Future supermodel Naomi Campbell appears throughout series 5 as an uncredited extra.