'Off of' is wrong isn't it? Our local radio station is always talking about traffic coming off of the A33 and it drives me mad.
Also the addition of 'what'. As in 'Our spelling is better than what it used to be.'
Both these are so common where I live that I'm not sure what is right or wrong now!
But the latest thing round here is 'done' being used for everything. She done the drawing, he done the cooking, I done it last night...