On the "Stairway" clip from Wayne's World, I stand corrected. They weren't able to use the actual intro to the song because of copyright law. I never knew that. That said, the whole premise of the "No Stairway" sign is correct, it's because too many amateurs come in and only know the intro.
No sure how many here listen to Soundcheck on WNYC but "Bohemian Rhapsody" will be the focus of today's installment as part of their Singles Smackdown feature. If you miss it, these episodes are archived on the site afterwards as podcasts.