Hi!
Some DC key corrections :
Future State : Justice League #1 : 1st team Appearance of the Justice League
This is a little bit vague. It should either be 1st team appearance of the Future State Justice League or, in my opinion, it should maybe not be a key at all as there are many versions of the Justice League for this to warrant a key status.
HellBoy : Wild Hunt #2, #3
This is also a little bit inconsistent. #2 is currently 1st Appearance of Nimue the Blood Queen and #3 is 1st Full Appearance of Nimue The Blood Queen. I believe #2 should be 1st cameo appearance of Nimue.
Justice Society of America Vol. 3 Annual #1
This is currently 1st appearance of Joker as an old man. I think it should not be a key at all, very minor and in any case we have seen this again in the past (Dark Night Returns is the first that comes to mind). In any case not a very important story beat.
Justice League Europe/International #33, Action Comics Vol. 1 672, Detective Comics Vo. 1 #639
These are all associated with Sonic The HedgeHog.
JLE is currently “1st comic app of Sonic the Hedgehog” (i dont think this is correct) and the other two are “includes a Sonic The HedgeHog Ad (pre dates promo comic)”, which is closer to the truth but again partially correct.
I think the correct description is the one included in the link below :
“16-page Sonic the Hedgehog comic insert included in multiple DC publications, often removed and sold erroneously as a rarer issuance”. Some version of this could maybe present a more accurate key reason.
Thanks for looking into these 
