A new documentary sheds light on the search for Marty McFly's red guitar from Back to the Future, which has been missing for 40 years.

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

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.