The first is a known variety known as the Die II Electo D 'g' variety. The second is a known flaw that occurs on several plate varieties of the 2 shilling maroon. The last appears to be a Plate 1 Die II variety that also includes a break in the nearby frame.
I have the B&W Specialized Catalogue's for both Kangaroos and KGV. You can find it new on ebay if you really want to get into all the various known varieties.
Thanks for the comment, pk-short, but I'm not really intending to get into the 'roos in a big way. I just happened to have found some good varieties recently in an old album. Thus the call for help here! (We can't all buy the specialised catalogues for everything, not least because they're very pricey in themselves.)
smauggie, I have the ACSC catalogue for the KGVs. If you want to know whether any of your varieties are listed (and only a very small proportion of varieties actually are listed) please don't hesitate to send me a message. I'd be happy to take a look for you.