Ok, I realize nothing posted here counts as “real” legal advice, all standard disclaimers apply, etc. etc.
But I’ve got an interesting situation for you legal-minded types to ponder.
Suppose I sign a contract to buy a house. Seller signs it too. It says the price is, say, 100.
Title company makes a mistake at closing and tells me the price is 50. I gladly pay the title company 50 and take possession of the keys. 
Seller wasn’t present at closing, but a few days pass and I have a recorded deed at the courthouse saying I own the place.
Title company realizes the mistake and comes after me for the remainder.
In my mind, I am wondering if I am legally responsible for the rest.
Technically, the title company has paid the seller on my behalf, therefore I have fulfilled the terms of the contract I signed.
And due to a collosal blunder on the part of the title company, they forgot to ask me to sign their “Hold Harmless” document, which has the errors and omissions clause stating I am responsible for potential errors in the price.
So, can I sleep soundly at night, or should I worry about getting sued?
(for those interested, this is the related thread: http://boards.straightdope.com/sdmb/showthread.php?t=273775 )