Extra words in a sentence that add detail and are set off by commas are called nonessential elements. This is because they are not essential to the sentence and story, they are simply an added bonus, without them the sentence still makes sense.
"Reckon I have," said Walter. "Almost died the first year I come to school and et them pecans-folks said he pizened' em and put' em over on the school side of the fence"
