Page 1, Panel 5 - Although Sandman almost always wore his trademark gas mask, he did change to the purple lycra-type way back in All-Star Comics #10. For more information, see Star-Spangled Comics #1 (1999).
Page 1, Panel 7 - This picture is a reproduction of the cover of JLA #113. Of great interest is the appearance in continuity of Superman & Batman with the JLA and more importantly, Hippolyta in yet another Silver Age JSA story. (Thanks to Graeme, for pointing this out)
Page 2, Panel 1 - This picture is a reproduction of the cover of All-Star Comics #3 - the first appearance of the Justice Society of America (1940).
Page 3 - Scarab did indeed work with the JSA against the King of Tears in 1944. But we are yet to see the story, which will presumably be told in a future JSA "Times Past" issue.
Page 5, Panel 3 - Kestrel was an enemy of DC duo, Hawk (now the villain Extant) and Dove, and was also a Lord of Chaos, hence the reason why the Dark Lord sought to kill her.
Page 6, Panel 3 - Jack Knight, being a fan of anything 'old', loves those old movie references........"Julie Andrews and killer dwarves".
Page 7 - Here we see statues honouring two deceased JSAers: Mr Terrific (Terry Sloane) and the Star-Spangled Kid (Sylvester Pemberton).
Page 13, Panel 3 - Jack once again refers to the old movie, "Don't Look Now".
Page 14, Panel 5 - The Flash parts the ocean, just as Moses did in the Bible. Naturally, Jack Knight relates it to the old movie "The Ten Commandments" which starred Charlton Heston as Moses.
Page 17, Panels 1-2 - The mother of this third baby managed to survive underwater for half an hour, indicating she could be super-powered in some way. Furthermore, she had been in a "coma for months.......DREAMING her life away." Could this 'mother' be Lyta Trevor (Fury) who was pregnant last time we read about her? Just a guess......
Page 21, Panel 2 - Hawkgirl has been having dreams "of ancient worlds, of other worlds." The 'ancient worlds' could relate to Ancient Egypt, where the Golden Age Hawkman and Hawkwoman originated. The reference to 'other worlds' could have something to do with the Silver Age Hawkman and Hawkwoman, who came from Thanagar, an alien planet.
Page 21, Panel 3 - The baby has conflicting life histories, as stated by Hourman: "One, only hours old" - presumably that of the baby, "and the other, virtually ageless", relating to the soul that will become the new Dr Fate. Who is it?
Page 22 - The Dark Lord is revealed as Mordru, an enemy of DC's 30th Century super-team, the Legion of Super-Heroes. Among his powers, Mordru has super-strength, transportation, and possible immortality. His first appearance was in Adventure Comics #369.