The skinhead in the black bomber jacket seen to be cheering on the "the kid" in his fight against the dreadlocked man, is also seen to be carrying off the losing fighter after the fight. Why would he be associated with someone he wasn't backing.
While the film is set in the mid-80s,when Kevin and his friend are in the alleyway selling the hire purchase car, a red bus with a partially obscured advert for the film Terminator Salvation on the side can be seen.
A 1990s Volkswagen Transporter can be seen as Kevin pulls away from the care home, even though it's set in 1985. Various anachronistic cars can be seen throughout the film.