Question: How does Frank get into the hands of the bad guys after Malcolm crashes into his house? It seems as if one minute the ambulance blows up, the next he is on a gurney.
Question: Does anyone by any chance recognize the make and model of that cool black wristwatch the main villain, Johnson, is wearing?
Chosen answer: The film credits Hamilton Watches. Since Jason Statham uses a Officine Panerai Watch, I think, the villain uses a Hamilton. It's a nice watch, but I can't find that model on Hamilton's web site.
Question: Why didn't Frank call his police friend to have him have bomb defusal experts ready for him and the woman at a location to get the bracelets off?
Answer: Deactivating a complex bomb like that would have taken time, which Frank did not have and he was being monitored by high tech hardware.
Question: In the train carriage at the end of the film why did the bad guy get off the car? He surely must have been aware that the bracelet got transferred onto him?
Answer: He didn't know the bracelet was on him until he was off the car.
Answer: Just before the scene ends, somone in black taps him on the shoulder and knocks him out. We can presume that the person in black is one of the bad guys.