Audio problem: During the football match when Forrest runs and bumps into the band players, we hear what sounds like cymbals crashing/dropping to the ground. But if you look at the band players he knocks over, there are no cymbals anywhere near them.
Audio problem: John Lennon's lips don't sync with what he's saying. Neither do Kennedy's or Johnson's or Nixon's.
Audio problem: In the shot that shows Forrest punch a man three times, there's problems with the sound effects. The first punch has no sound. The other two are too late, they appear after the punch.
Answer: Presumably, Forrest called Dan and invited him. He seemed surprised to see Dan standing. The last time Forrest saw Dan he was in a wheelchair. His reaction was all about Dan's "magic legs".
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