The film made two crucial errors in its iconic dance scene, where Fox's McFly performs "Johnny B. Goode" on a now-famous Gibson ES-345

Great Scott! The search is on to find the guitar Marty McFly played to a crowd of '50s-era high school students at the Enchantment Under the Sea Dance back in Back to the Future, which celebrates its 40th anniversary this summer.

Marty McFly grabbed a guitar in “Back to the Future” and rocked out with the band at a 1950s high school dance, helping him narrowly avoid blinking out of existence before time-traveling back to the 1980s.