Most of these are already fixed in svn, some CSS improvements for heading style were made, in some cases like in the Feed Manager it revealed we were using an h2 where it should be an h3. You can fix this in your copy by editing the /FeedManager/FeedManagerModule.ascx
For other issues you can add this to your css:
.pagelayout h2, .register h2 { font-size:14px; }
I've actually updated the download for 2.3.3.6 to patch these issues so they are already fixed for new downloads.
Best,
Joe