Even Broadway has "interesting" dress rehearsals

http://nymag.com/daily/entertainment/2009/10/set_snafu_at_bye_bye_birdie_mars_final_preview.html

A mishap with the set stalled the first act for 20 minutes at the final preview for "Bye Bye Birdie" on Broadway. John Stamos did improv comedy stand-up with audience members Bob Saget and Don Rickles!