One I ran across when I moved to Wisconsin (though not everyone uses it so it may not be a regionalism, just poor education) is "I borrowed something to someone". Gah! No. Loan to & borrow from.
I also see loose & lose used interchangeably in writing. That would mean loser meant less tight, no? : )
I can't do effect/affect with any real consistency (also, a synonym is a word that replaces the one you can't say, spell, or use correctly).
However, some things just stick with you from childhood. I still say "I'm fixing to do xyz" or "I'm fixing to go to the store" etc. Very southeastern USA, y'all.