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
Starring: Gwyneth Powell, Lee Cornes, Sally Geoghegan, Stuart Organ
Genres: Family
Field Trip - S6-E6
Continuity mistake: When Roland plays his tape recorder on the coach, the woman on the tape says "lightest lemon sponge I've ever tasted - she used to bake, yes I remember, mind you she worked hard that woman..." But in the cafe Roland didn't start recording until she said "mind you she worked hard..."
Imelda: I'm gonna get my dad down here to sort you out.
Mr Baxter: You do that, get your whole family down here, I expect they'll be glad to hear you've been nicking money off first year students. You get them all down here, tell them to wear a funny hat and we'll have a party.
Trivia: Future supermodel Naomi Campbell appears throughout series 5 as an uncredited extra.