Well, this interview did one thing - it made me research the ampersand ("&") more. I didn't discover any breathtaking revelations, just that ampersands are recommended by most style guides to be used in company names.
But - apparently when it comes to screenwriting, an ampersand is used between the names of two screenwriters in the credits if they worked on a screenplay as a team. However, if two or more screenwriters worked on the screenplay separately, at different times and different places, then their names are separated by an "and" in the credits. I think we can all agree that that's a neat factoid.