There are several organizations that have direct broker feed agreements with the Zillow Group. This means that Zillow gets SmartMLS listings directly from these offices, rather than from the MLS.
William Pitt Sotheby's International
William Raveis Real Estate
Coldwell Banker Residential Brokerage
Berkshire Hathaway Home Services (BHHS)
In addition to these four large organizations, there may be a few smaller offices that also have their own direct feed agreement with Zillow.
Regardless of the size of the organization, if there are any problems with the way listings from these offices are displaying on Zillow/Trulia, the SmartMLS really has no influence, since we are not the source of their data feed. Any issues have to be addressed directly between the office and their specific Zillow contact.