Bat Goddess says that Irene Saletan thinks she heard herself and Ellen singing "I'll Fly Away" in the middle of the movie.

DON'T THEY WISH?

That was Alison Krauss and Gillian Welch.

Art Thieme did not see George Clooney singing "I Am A Man of Constant Sorrow" in the trailer. George was lip-synching to a recording of Dan Tyminski (from Alison Krauss & Union Station) singing it.