Corrected entry: On the 40th anniversary edition DVD, there is a behind the scenes interview with the actors who played the Von Trapp children. One of them comments that they thought during the scene in the Abbey with the Nazis rattling the gates, that the children who were with Julie Andrews were making too much noise. Charmian Carr says (joking) that they were with the star of the movie (Julie Andrews) so they were allowed to make noise, but in the movie Charmian is with Christopher Plummer's group, not Julies.
tattoojunkie
31st Jan 2009
Correction: This does not mean though that one or more of the children weren't switched around and placed differently, before the director finally settled on the grouping that is seen in the movie.
tattoojunkie