Jason Statham plays a homeless war vet here, making 2013 the second year in a row he played a homeless man, after 2012's Safe, where he was a homeless former fighting champion.
When Cristina takes pictures of Joey at the fountain and the restaurant she uses a Nikon D300s. However, the camera which is laying on the table in the apartment is a Nikon D70s.
At the beginning of the film, Joey is beaten up, leaving his right arm injured and immobilized. But, when he reaches the rooftop, running away from one of the men who beat him, he crosses a sort of bridge leaning on his right arm while having his left arm immobilized. After this frame, he switches back to "normal".