The Mayoress meets with Fowler in the lobby of the police station, and asks him where his office is, so they may meet privately. However, she should know where it is, having talked to him there in a previous episode.
The Mayoress asks Patricia to bring her a cup of tea. A moment later, she returns with the cup and places it violently on Inspector Fowler's desk. However, no tea spills out - Patricia brought in an empty cup.
During the scene where the crew are proctoring with the riot gear, you can see the reflections of the studio lighting in the riot shields.
Constable Gladstone refers to Lulu coming in second place at the Eurovision Song Contest with her song "Boom Bang-a-Bang." She actually finished in a 4-way tie for first along with Lenny Kuhr from the Netherlands, Frida Boccara from France, and Salomé from Spain. This is the only time in the history of the contest that there were joint winners.