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 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.