Bradley Jay Fills In On NightSide with Dan Rea:

No, that wasn’t a typo. We know it’s “for all intents and purposes,” but alas, how many times have we heard it the other way? How about it being a “mute point,” instead of “moot point?” Bradley’s talking eggcorns and fake grammar rules with Mark Liberman, Christopher H. Browne Distinguished Professor of Linguistics and Director of the Linguistic Data Consortium at the University of Pennsylvania. Don’t get “flustrated!”