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Factual error: They dig a tunnel in West London and should therefore be tunneling through London Clay. But the substance they tunnel through isn't London Clay. The actual crime scene photos in the 'Bonus Features' also show London Clay. Furthermore, the substrate that they do tunnel through would require shoring, but none is used.
Factual error: In the scene where Terry makes a phone call to the garage to see if Eddie is ok, Ingrid the receptionist tells him that unless he wants to see Eddie again he must call a number beginning with 01946. However in 1971 the entire area code of London began with 01, it wasn't changed until May 1990 where it split into 2 different area codes. As the film is only taking place in London involving all characters, the area code doesn't need to be given unless Lew Vogel was elsewhere.
Factual error: The opening scene, set in 1970, is played over the song "Get it On (Bang a Gong)" by T. Rex. That song wasn't released until 1971. [Note: since the film is more or less the true depiction of a real event, the appearance of a 1971 song in 1970 is anachronistic.]
You may also like: Iron Man | Vantage Point | Indiana Jones and the Kingdom of the Crystal Skull | The Dark Knight | The Chronicles of Narnia: Prince Caspian






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