Several flags appear in dramatic fashion. Forrest Gump's best friend Bubba looses his life in Vietnam, but Forrest decides to live out Bubba's dream fishing for shrimp.
Here the US flag is on the flying on the shrimp fishing boat Jenny. Note that Forrest Gump was filmed at the apex of natural colour filming. Currently as of 2014 movie directors, since the Matrix in 1999, opt to film in a genre of limited colours. Maybe soon they will go back to black and white since natural color movies are out of fashion
Here the US flag is in the background next to several other flags, including the US Army flag.