Нашел информацию по ошибкам фильма
Вот что нас интересает:
Anachronisms: The amplifier Marty is playing at the dance appears to be a Fender Bassman, first released in 1959, four years after the dance took place.
Factual errors: Marty plays a Gibson ES 345 model guitar in 1955, but they were not produced until after 1958.
Continuity: The neck of the Guitar that Marty plays as a fill-in at the dance is seen to have tuning pegs on both sides of the head, but when a close up of the picture of his family stuck between the strings is seen, the head has Stratocaster style tuning pegs, all along the top.
Continuity: At the dance, the picture under the strings at the head of Marty's guitar disappears in long shots.
Audio/visual unsynchronized: At the end of Marty's "Johnny B Goode" guitar solo, the drums can still be heard, but a shot of the drummer shows that he is not playing the drums.
Audio/visual unsynchronized: When Marty plays Johnny B Goode, at the end of the movie, the double bass sound is the sound of a slapped double bass (the string pulled and knocked on the wood to give it a percussion effect), while the musician plays normally with his fingers.
Audio/visual unsynchronized: During Marty's audition for the dance, the drummer is clearly not playing what we are hearing. We only see the drummer hit the high-hat and the snare, but we occasionally hear the crash cymbal and toms hit.
Взято отсюда
http://www.imdb.com/title/tt0088763/goofs