Revealing mistake: As Terry and Martine approach Le Sac shop, you can see reflections in the window of that shop of trees. This gives away the fact this was a custom built set (as shown in the extras) and not the real location in London. (00:20:05)
Revealing mistake: When Terry hits the old man to the floor it's clear that under the grey coat is padding, to protect the actor. (01:34:00)
Revealing mistake: When they demo (and drop) the thermal lance, a wooden table flips on its side in the chaos. Immediately afterwards you can see a linear actuator they used to flip the table attached to one leg.
Answer: The complete story isn't known. There was a bank robbery, and after a few days of press coverage there was a gag order put in place to keep the press from talking about it. No one knows for certain why other than the people who were involved. This film is speculation, a possible reason for why there was a gag order. The producers of the film claim to have been working with an inside source who knew the truth for the gag order and cover-up. Whether the producers really did have an inside source, or that the source was telling the truth, will likely never be known for certain.