Could be - I remember Heckle and Jeckle. Although I guess they were supposed to be Yellow-billed Magpies, even though they were all black.
Quite possible - crows and ravens with yellow bills is a stereotype that also seems common in Germany. Although unlike Californians, we do have Alpine Choughs, which anyone going on a ski trip in the Alps is probably familiar with. So that's one possible origin for the misconception. Another one would be Rooks, whose pale bills might be mistaken for yellow, but they don't occur in America, either.The only possible thing I can think of (not sure if this has been previously said in this thread or not?) is that maybe people's memories are somehow being influenced by cartoon/comic-strip portrayals of crows with yellow bills? (Dumbo and, in Britain at least, the Kia-Ora orange squash adverts come to mind...)
and yet no one has produced a photo of one
I think the bird was holding something after all: I've had similar experiences with crows carrying things in their beaks (e.g. corn cobs). Take an out-of-focus shot and you've got your yellow-billed crow!
But I like the fact that a pic showed up immediately after someone complaining.
Not sure how anyone that actually can correctly ID a crow could mistake a starling for one. I mean... size, tail length, bill size and shape... As for Disney's crows, someone finally just asked the studio.
http://www.lauraerickson.com/radio/program/10384/disneys-crows/