It was originally announced on 20th May 2014 that Henry Jackman and Matthew Margeson would be writing and composing the music for this picture but later on 11th July 2014 it was reported that Gary Barlow would be the film's composer.
Roxy's uncontrollable free fall at the climax is entirely preventable. A proper body arch position results in a stable free fall. As she has jumped from an airplane before, she should have been trained extensively on proper free fall position and how to recover if she finds herself spinning.
When Eggsy is running from security in Valentine's base, he is holding a gun in one of the initial shots despite being unarmed when entering. He does not actually obtain a handgun until he disarms a guard later on.
As part of the plan to foil Valentine, Roxy has to ascend into the upper atmosphere, requiring her to wear a special suit. The suit is labeled "Roxy" on the front. Throughout the film, the secrecy of Kingsmen has been a major plot point -the organization and their individual true identities are unknown. The suit should have been unlabeled, or, if labeled, should have read "Lancelot," thus protecting her real identity.