The Justice League headquarters is a satellite named Watchtower.
Eddie looking at the crystal one last time and seeing multiple speedsters are shots taken from previous seasons:
- Hunter Zolomon/Zoom's flashback was taken from "Enter Zoom", during his fight against Barry.
- August Heart/Godspeed's flashback was taken from "Pay the Piper", although it was August's 5th clone who fought Flash and Pied Piper.
- Barry Allen/Savitar's flashback was taken from "The Wrath of Savitar", when Savitar manipulated Wally West/Kid Flash into throwing the missing piece of the Philosopher's Stone into the Speed Force, thus freeing him from his prison.
- Eobard Thawne/Reverse-Flash's flashback was taken from "Rogue Air", when Reverse-Flash was facing off Flash, Firestorm and Oliver Queen/Al Sah-him.
Unlike the Reverse-Flashpoint, Chester and Allegra are happily married in the future.
Even though the surface of S.T.A.R. Labs has been converted into the Flash Museum, the Team still uses the basement level as their base.
The Negative Speed Force shows that it's willing to let its avatars be happy if they kill the Speed Force avatar, rather than just drive Eddie crazy like Eobard.