Most of the credit outstanding series in the G.19 have been significantly revised.  Terms of credit series (interest rates, loan periods, etc.) were not.

On September 10, the FRB explained the revisions (citation).  We quote in part:

... Because of the benchmarking process, the G.19 data have been revised from December 2010 forward. Due to changes in the representativeness of the monthly sample since the earlier benchmark in 2005, there are considerable discrepancies in some categories between the pre-benchmarked and the benchmarked estimates. Such discrepancies are reflected in the statistical releases as series breaks in December 2010 (the benchmarking month) ...

On September 7, the FRB announced the revisions (citation):

The Federal Reserve Board announced on Friday the completion of the 2010 Census of Finance Companies and Survey of Finance Companies. These data have been collected every five years to provide a comprehensive and accurate statistical snapshot of the balance sheet of the finance company industry. The statistical results of the 2010 surveys will be incorporated in the July Consumer Credit (G. 19) statistical release that is scheduled to be published on Monday, September 10th.

In addition, the survey results will be incorporated in the July Finance Companies (G. 20) and Flows of Funds (Z. 1) statistical releases that are scheduled to be published later in September.