Edgar Wright went to incredible trouble to set the film in Atlanta. It features Atlanta landmarks, culture, food, and dialect. It feels quintessentially Atlantan.
Despite that effort, they're constantly referring to highways and interstates with the definite article. "The 75", "the 85", "The Buford Highway". We don't do that here, and it sounds a bit like nails on a chalkboard.
It's hard to fault the film for this trivial issue, but it is amusing.