Yeah, I too had problems imagining Gump figuring out those puzzles
(Anyone know the scene in Franc Caliendo's stand up where he mentions that he thought it was odd for Forrest Gump and Apollo 13 to come out in the same year, with the same actor? "Hou-STON we have a pro-BLEM!" "No duh, you got Gump flying the shuttle" ROTFL)