When Henry and Anthony are walking through the campus, Henry points out one of the girls walking ahead of them. Seconds later, you can clearly see her as an extra in the background.
After the Kray family meeting at the Waldorf near the film's beginning, Jack Kray emerges onto the street, and into an angry gay rights protest, with dark hair which he doesn't sport in any other scene. It's unexplained, and not a flashback because Anthony climbs onto his car as part of the protest.