It's flawed. Google claims a Bacon number of > 1 for Johnny Carson, Rosie O'Donnell and Jay Leno, but he sat for interviews on their talk shows. Also, the results for some musicians include recorded-footage appearances in movies where they had no interaction with the cast.
Still seems to be just a rather clear distinction between being in a movie or not being in a movie, regardless of significance of the part or role played. To me this doesn't seem like a flaw.
