Where to begin? :)
You spotted the main one. Who God is, who Jesus is.. Heretical Christology.
Mormon heresy is an odd, unique mix. Here’s a brief list of early heresies and you can see pieces of LDS in some:
http://www.ignatiusinsight.com/features2005/kwhthd_ancntheresies_july05.asp
Thanks for the link, I’ll check it out.