The dream Grayson tells is from "Robin Dies at Dawn" in Batman #156 (June 1963).
Robin War continues from Robin: Son of Batman (DC, 2015 series) #7.
Dick mentions having met Azrael before. This occurred in this continuity in the series Batman and Robin Eternal (2016). Azrael doesn't recognize him, as he is using hypnos here, and was not in that meeting.
1:25 variant cover.
1:25 variant cover.
Enter the Dragon movie homage.
Parody of the Creature from the Black Lagoon film poster.
Cover is tribute to Batman (DC, 1940 series) #237.