(see question: http://www.trulia.com/voices/qa/Taunton-Home_Buying-37-36368 )
Getting the info modified is not easy.
I'd spread the word to use actual real estate professionals' sites rather than ones where the correctness of the data is not as important as gathering and selling your name and email to the highest bidders.
(Please note: when you choose an answer as a Best Answer, or at least give a thumbs up, it helps those who answer questions here.)
trulia displays information on houses that is gathered from third parties and then they display it on the site (often some of the info is incorrect). However, if you house is listed, your agent can create, claim and/or add pictures. I hope this helps. firstname.lastname@example.org