I always thought that funky Pilgrim looking dude was Barbara Bush!
j/k
Old Fashioned oats are just pressure rolled (ie, flaked). I guess they don't heat them as high as they do for the "Quick" version. I like eating the old fashioned ones better than either the instant or the quick. They have better texture and flavor, IMHO.
As far as mashing them, I just add them to the mash, same as flaked wheat, flaked barley, or flaked corn. The rolling process gets them hot enough so that they are gelatinized so you don't have to actually cook them (e.g cereal mash them) like you would with any other unmalted grain like rice or polenta.
HTH-