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
Continuity mistake: The third years in this series were first years in series two.
Vince: My uncle looks like Frank Bough.
Trev: Who cares, Vince?
Vince: My Auntie.