Continuity: Kai's socks appear to change color a number of times throughout the film, often from shot to shot within the same scene.
Continuity: When the camera is far away from Akira's capsule, the nameplate is in katakana (a Japanese alphabet). When Tetsuo walks closer, it has mystically been translated to Romaji (English) characters.
Continuity: Near the beginning of the film, in the street bar, the sign on the jukebox changes from "MASTAR" to "MASTER" between shots.