Even as a Southern California native, nothing quite prepares you for Coachella heat.  "Coachella heat."  I say it like the phrase is a thing people say — but judging by the number of times I heard people complain about the darn "Coachella heat" on set, it seems alright to use here. But being an extra on a production as large as this remake of A Star Is Born is, you don't get much say: you just take the hot water bottles and acknowledge how lucky you are to be there.  In the beginn