When you watch Justice League in cinemas later this year, pay close attention to the skin between Henry Cavill's nose and mouth, as it's potentially cost Warner Bros. millions of dollars to digitally scrub.

With the high-profile superhero team-up movie (think DC's version of The Avengers) in the midst of reshoots, a bombshell report has revealed that Warner Bros. are spending an unprecedented $25 million on additional filming, along with using CGI to remove a mustache Cavill is legally restricted from shaving off.

Justice League cast members Ben Affleck, Ezra Miller, Gal Gadot, Ray Fisher and Jason Momoa pose at Comic-Con last weekend credit: Kevin Winter/Getty Images

According to Variety, filming for the project has gone on far longer than initially scheduled, meaning some of its stars have been forced to shoot new footage at the same time as they work on other films.

While Ezra Miller, who plays The Flash, has created little drama while he concurrently films the sequel to Fantastic Beasts and Where to Find Them, Superman actor Cavill is in the middle of shooting Mission: Impossible 6, and studio Paramount Pictures have barred him from shaving off the mustache he sports for the film.

Henry Cavill shows off his face fuzz earlier this month credit: Dave Benett/Getty Images for Jaeger-LeCoultre

This has meant Warner Bros. will have to use CGI to digitally shave Cavill's face for several scenes in Justice League, creating another headache for a film that is currently being directed by Joss Whedon, who stepped in to take over from original director Zack Snyder after he experienced a family tragedy.

The report also reveals that Whedon is by and large filming additional scenes that help better connect the action set pieces already shot by Snyder, with Warner Bros. determined the movie replicates the critical kudos earned by Wonder Woman earlier this summer. That film has gone on to become the second most successful film of the year at the US box office after Beauty and the Beast.

More Wonder Woman than Suicide Squad: Gal Gadot and Ewen Bremner in the box office smash credit: Clay Enos/Warner Bros.

Warner Bros. also seem to be learning from the mistakes of Suicide Squad, the financially successful but critically drubbed super-villain team-up from last year, which was written in six weeks, rushed into production, and ultimately edited by a company that ordinarily makes movie trailers.

Moving forward, the report suggests that the studio is now factoring in additional weeks and budget for reshoots for its franchise movies, following high-profile fine-tuning to the likes of Rogue One: A Star Wars Story, the forthcoming Han Solo spin-off, and the doomed 2015 reboot of Fantastic Four.