There seems to be an increasing trend to use the following types of phrase in spoken language:
He was sat (meaning "he was sitting");
She was stood (meaning "she was standing")
These sound wrong, but I can find no reference to them as common errors in books on grammar.
They are not 'common' errors in the sense that well-educated people slip-up with such mix-ups. what you quote are just a couple of examples of the mind-blowing poor grammar in America, of the "I had went" variety.
Please don't tell me these examples come from the UK ! ?