how do I report/correct indexing errors, in particular get the correct picture displayed
Look at this page: https://www.familysearch.org/ark:/61903/1:1:QLXW-YYLQ?from=lynx1UIV8&treeref=LTXR-R2T. Please note that the "Original document" (first attached picture) in the upper left part of the screen is a "blank" form, i.e. no names etc.
This is the page which has been indexed: https://www.sa.dk/ao-soegesider/da/billedviser?bsid=13110#13110,435907, and btw a few of the family members being omitted in the indexing.