Citing anonymous insiders, Variety reports that extensive reshoots, spread out over two months between London and Los Angeles, cost about "approximately $25 million," compared to the $6 million to $10 million a typical film spends on additional photography.
That two-month window has complicated the lives of some of Justice League's stars, like Ezra Miller and Henry Cavill, who have already moved on to other projects. Miller's schedule has been relatively easy to accommodate, as the sequel to Fantastic Beasts and Where to Find Them is also a Warner Bros. film. However, the site contends Cavill's situation is a bit more tricky, as he's forced to split time between Justice League and Paramount's Mission: Impossible 6. Cavill grew a mustache for the latter role, which he's not permitted to shave, which means the facial hair will have to be digitally removed from reshoots.
There's also the the matter of the credits for Justice League after director Zack Snyder stepped aside in the wake of a family tragedy and was replaced by Joss Whedon. Variety asserts Whedon won't be listed as co-director, but may receive a producer or a screenplay credit.
The cast of Justice League used its time at Comic-Con International in San Diego to downplay any fears from fans over the reshoots. "They’re brief if anything,” Cyborg actor Ray Fisher said. "Zack picked a great director to help clean up for us."
Arriving Nov. 17, Justice League stars Ben Affleck as Batman, Henry Cavill as Superman, Amy Adams as Lois Lane, Gal Gadot as Wonder Woman, Jason Momoa as Aquaman, Ezra Miller as The Flash, Ray Fisher as Cyborg, Willem Dafoe as Vulko, Jesse Eisenberg as Lex Luthor, Jeremy Irons as Alfred Pennyworth, Diane Lane as Martha Kent, Connie Nielsen as Queen Hippolyta and J. K. Simmons as Commissioner Gordon.