'The Flash' originally ends with Ezra Miller's character being joined by Sasha Calle's Supergirl and Michael Keaton's Bruce Wayne.
However, when Discovery takes over at Warner Bros., CEOs Michael De Luca & Pamela Abdy (who are in charge at DC at that time) got Henry Cavill and Gal Gadot to film the new ending with Calle and Keaton's characters.
The new WB CEOs also moved forward with 'Man of Steel 2' and 'Wonder Woman 3' after teasing Cavill and Gadot through 'Black Adam' and 'Shazam! Fury of the Gods.'
Later on, Warner Bros. Discovery CEO David Zaslav appointed James Gunn and Peter Safran for DC which brought new ending to the movie scrapping Cavill, Gadot, Calle, and Keaton altogether.
The new ending is with George Clooney's cameo that started as a joke; “How many Batmen can we get?” Then Gunn initially agreed and then the cameo was filmed in January.
點解James Gunn要搵史上最差真人Batman客串Flash ending