Deliberate mistake: In the scene where Forrest is describing his heritage, the clip of KKK on horses is taken from The Birth of a Nation. In this clip, you can see tire tracks on the dirt road well before automobiles were supposed to be in existence. Robert Zemeckis decided to leave this mistake in to perfectly match the clip to the original movie.

Forrest Gump (1994)
1 deliberate mistake
Directed by: Robert Zemeckis
Starring: Gary Sinise, Robin Wright, Robin Wright Penn, Sally Field, Tom Hanks
Factual error: During the 1972 New Year's Eve celebration, Forrest drinks a Dr. Pepper with a logo that wasn't devised until around the mid 80s.
Drill Sergeant: Why did you put that gun together so fast, Private?
Forrest Gump: Because you told me to, Drill Sergeant!
Trivia: Dave Chappelle was originally offered the role of Bubba in Forrest Gump in a pre-production stage. He was concerned that the character was racially demeaning, so he turned down the part. He has since admitted to regretting the decision.
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Answer: Many adults in the 50's, like Forrest's mom, found Elvis' gyrations and hip movements to be too sexual and inappropriate for children (especially teens) to watch. In fact, when Elvis appeared on the Ed Sullivan show for the third time, they only filmed him from the waist up to prevent an outcry from these types of parents. Many also found Rock 'N' Roll music in general to be inappropriate for children to listen to.
Bishop73