3: My heraldry isn't good enough to know every coat of arm present!
Well I can tell you that the crests in the black stripes essentially play out as a who's-who of the Holy Roman Empire states plus the Netherlands. You've got all the big ones in there. Prussia/Brandenburg, Bavaria, Saxony, Hanover, Mecklemburg, Mainz, Trier, Brabant, Guelderland (I think), Lorraine...everyone who is anyone really. Around the outsides you've got the epic Hapsburg shield linked above, possibly the shield of Mattias Corvinus there next to it (well, it shows his kind of territories...Croatia, Hungary, Ragusa, Transylvania, all the rest), you've got the Polish-Lithuanian Commonwealth next, then what is I think the current Danish royal crest. I don't recognise the bottom left though it might be Belgium considering the motifs. Then you have the Papal crest, the Dutch royal crest and the last two I don't recognise though those lions are somewhat Netherlands-esque in style so they might be Stadtholderates. Finally, to top it off, is the Russian double-headed eagle in the centre.