Continuity mistake: When the initial site team comes to the Tatum's, the second jeep in the convoy has the same supposedly unique serial number as the one the general arrives in a week later.
Factual error: When Elvis arrives in Washington in the beginning in his dress blues he is missing his name tag above his right-hand pocket and missing his service ribbons above the left pocket.
Factual error: Ma Tatum, while bemoaning Pappy's misfortune, sits herself on a burlap bag marked "Mash". Mash, the basic component of moonshine, is a semi-liquid, and couldn't be stored in a burlap bag.