This issue has variants.
There is an 8 page insert in the middle of the book which includes a 4 page promo for DC Rebirth Wonder Woman and Justice League, and a 4 page Snickers ad featuring Superman, Batman, Wonder Woman, and Doomsday. The insert appeared in all DC titles released this week.
Inker's last named is misspelled as "Hennessey" in the issue credits, but the cover is signed "Hennessy".
Black Jack first appeared in the previous issue, but was not identified by name until this issue.
The Deluge were previously seen in Aquaman: Rebirth (2016 series) #1.