On the second dvd of bonus material they come to a part mentioning The Beatles early influences as several early r&b artists. Then it was mentioned they also liked the girl groups. They mentioned The Shirelles and showed a photo of them for a mere second and then said The Chiffons but, the photo they showed was The Marvelettes. It was the four of them from one of those James Klingmen promotional photo's that are so well known. I wondered if anyone else caught that. I was surprised that got by someone as meticulous as Ron Howard. Then many films have mistakes.