Factual error: When the barracks are completely flooded, several of the trainees shove shower hoses down the toilets for an "unlimited supply of air" (Merlin describes it as "simple physics"). However, that old fireman's trick is a technique for surviving dense smoke, which is not under fluid pressure. In the barracks flooded 9 feet deep with water, the pressure would be so enormous that it would easily gush straight down the toilets in a powerful torrent, eliminating any "unlimited air supply."
Kingsman: The Secret Service (2014)
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Directed by: Matthew Vaughn
Starring: Samuel L. Jackson, Colin Firth, Mark Hamill, Taron Egerton
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More mistakes in Kingsman: The Secret Service
Harry Hart: Are we going to stand around here all day, or are we going to fight?
Trivia: There is an additional scene about two minutes into the end credits.
Question: Harry told Dean he had enough information on him to have him locked up for life. What information was this?
Answer: CCTV surveillance and such like. And a possible kingsman informant embedded in the gang leaking incriminating info. Or police informer who reports to kingsman. Or, y'know, he was lying.
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Answer: Details aren't given, but it seems that Dean is involved in local crime along with the gang that hangs around with him. Even if Harry is bluffing, and doesn't have specific proof, it is clear that he is abusive and he has the recording of him threatening Eggsy.