3. Tom Hanks learned his Forrest Gump accent from his young co-star, Michael Conner Humphreys.
When Hanks signed on for the role of Forrest Gump, he wanted to tone down the Southern accent. Director Robert Zemeckis encouraged him to give the thick accent a try, claiming it imperative to the story line. Hanks agreed and modeled his dialect after Humphreys, the actor who played young Forrest Gump and had an authentic southern accent.