New Recruits - S5-E2
Factual error: The contract Stone and his team force Carlton Wood and Harry Fielding to sign guaranteeing Fowler's widow the royalties from his invention for life is signed under duress and is therefore invalid. It is hard to believe that none of Stone's team know this, but it is impossible to believe that Carlton Wood wouldn't.
Not What It Looks Like - S3-E2
Factual error: Season 3, episode 49 (Not What It Looks Like). Breaking glass with sound is possible, but would not work as depicted in the episode. First, in order to break the glass, you have to force the glass to vibrate at its natural frequency - that is, the frequency at which it would vibrate if it were tapped. Each piece of glass has its own natural frequency, depending on a range of factors including size, chemical makeup, shape, hardness, and manufacturing methods. No single frequency would shatter all the glass in the store at the same time. Finally, in order to break the glass the piece has to be closed-ended. You can't shatter a plate of glass with sound (nowhere for the sound waves to resonate). Please see http://www.madsci.org/posts/archives/feb98/887203231.Ph.r.html.
Factual error: At one point the barristers are seen going into the old arch entrance of the Old Bailey. However, you cannot actually go in that way, it's blocked off, you have to go in the more modern entrance and through a series of security checks.
Cheatty Cheatty Bang Bang - S2-E3
Factual error: They are watching the BBC mini series of Pride and Prejudice and you can hear ending music, but that music is not played at all in the mini series.
Factual error: At the car auction the Jaguar that the UCOS team are buying is described by the auctioneer as a 1967 model, but it is a C reg, which dates it to 1965.