We don't have a trivia or "goofs" section here (or if we do I'm too dimwitted to find them) so I thought I'd point it out here.

In the scene where Mark David Chapman (Jared Leto) meets little Julian Lennon in the park, the nanny closes with "Say good-bye to Jared."

I'm usually oblivious, or so caught up in the narrative that I miss these things, but I'm quite surprised the director missed this both during filming and during editing.