The Flash's Place in the DC Universe: A Closer Look.

TL;DR
Two scenes in "The Flash" prove that Zack Snyder's cut of "Justice League" is canon, not Joss Whedon's "Josstice League." One scene involves Barry's time travel, which only occurs in Snyder's cut, and the other involves Iris West remembering a scene that was only in Snyder's cut. This is important to Snyder's fans who fought for his cut to be released and solidifies the continuity of the DC universe. "The Flash" is also seen as closing the door on DC's past and starting a new beginning with Blue Beetle.
- Proof The Flash is Canon To The Snyder Cut, And Not Joss Whedon's Justice League Yahoo Entertainment
- The Flash Just Isn’t a Good Endpoint for the DCEU IGN
- Review: The Flash isn't a terrible film—just a forgettable one Ars Technica
- The Flash: Easter Eggs & DC Movie References Screen Rant
- ‘The Flash’ Is the Past; ‘Spider-Man: Across the Spider-Verse’ Is the Future Vanity Fair
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