https://screenrant.com/the-flash-changes-fix-box-office-failure/
The Flash faced many challenges that influenced its box office failure. However, the movie could have fixed a few key details to soften the blow.
10 random changes/additions that couldve improved it/made it more an event (imo):
-Less (bad) CGI. e.g. There was literally no need to CGI Nicolas Cages face. (also no so much CG Christopher Reeve - just used footage of him from the 80s Superman films)
-Ditched the falling babies opening. it was silly, unconvincing and abit creepy, (and unnecessary)
-Cavill should have cameo'd for real (e.g. Zod had captured Kal-El and uses him to fight supergirl before Batman takes him on in an alternate BvS scenario. or just used him at the end)
-Burtonverse Bat villain cameos (e.g. Arkham Asylum scene - BDW/Dent, CG Robin Williams/Riddler, Patrick Stewart/Freeze, Demi Moore/PoisonIvy. plus non Arkham cameos from Michelle Pfeiffer as Catwoman and Nicolson's Joker somehow), also Winona Ryder as Batgirl. and Cage Superman interacting with Keaton Batman (as mightve happened in Burtons Superman Lives)
-some Batmobile action!
-Lynda Carter cameo as WW (they had 4 batmen & 4 supermen: including the tv versions. but only 1 WW?)
-end scene probably shoud've had Barry with Affleck, Cavil, Gadot and Aquaman/Cyborg (Clooney couldve been moved to a fun post end credit cameo)
-also cameos from other DCEU actors throughout the film (Margot Robbie/Harley, Jared Leto/Joker, The Rock/Black Adam, Amy Adams/Lois)
-release after Aquaman 2 as the grand finale to the DCEU (summer 2024)
-changed the title to reflect its a 'No Way Home/Multiverse of Madness' style multiverse movie. e.g. 'Flashpoint: Into the Multiverse' or even 'Batman & The Flash: Crisis of the Multiverse' (so at least 'Batman' is in the title)
School girls having a crush on the Flash was the worst part, given the actor's real life troubles.
The falling babies was cringe, but funny. The baby in the microwave was even more cringe. At least he saved the rescue dog in the end credits.
Plus maybe a Kim Basinger cameo (CG deaged to 1989 era) perhaps Bruce could've reminisced about her/flashback to their post Bat89 break up
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