Although the filmmakers went to considerable effort to either cover, remove, or replace English-language labels (replacing anything with Roman letters and Arabic numbers with symbols or blanks), they didn't catch them all. In some shots at Herne Hill Velodrome, signage is changed to be symbols, but in others the picture has simply been mirrored to disguise adverts that surround the track. Most street scenes use mirrored footage to disguise text, but in one darkened shot, the car registration plates are clearly the right way around.
About halfway through the film, at the beginning of the scene of the revenge attack at the artificial sports field, a camera mounted on a yellow tripod with an operator is visible in the background at the far side of the pitches from the action.
After Ryan tries to wash off the party-prank face markings, he goes into the kitchen. Just before he bends down to look at and taste the fridge door deposits, a mic and boom can be seen reflecting in the window.