Revealing mistake: Obvious CGI flames were used during the science lab fire, because when the teacher knocks over the Bunsen burner onto the flammable liquids, parts of the workbench instantly catch fire that were nowhere near the liquids.
Episode #4.7 - S4-E7
Factual error: In this episode Blackwall Station is shown as a London Underground tube station. Blackwall Station is a Docklands Light Rail (DLR) station. Also look at the destination sign on the front of the train, which reads 'THAMES LINE', No such line/station exists on the London Underground.
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