Continuity mistake: Calley and Georgina are sitting a mock exam that Mr. Robson is supervising. Later on Calley and Georgina have somehow got out of the exam and are at the unveiling of the advert in the corridor. The next scene Mr. Robson is in Mr. Hargreaves' office when Chrissie is being falsely accused of swapping the adverts over, later on Robson is back in the classroom when Calley and Georgina finish their exam.
Grange Hill (1978)
1 mistake in Episode #14.7
Starring: Gwyneth Powell, Lee Cornes, Sally Geoghegan, Stuart Organ
Genres: Family
Maria: Do you know what you are, Parrott?
Mr Parrott: Mr Parrott to you.
Maria: A complete prat. The kids know it, the teachers know it, and now it looks like your ex-fiancée has got the message as well.