The 2018 movie Tag, based on men who play a month-long game of tag, had an all-star cast, and Jeremy Renner played Jerry Pierce, one of the game's players. While you wouldn't think a movie with a simple premise like this would require much CGI, an accident made CGI a crucial part of the movie. As Jon Hamm, one of the other actors in the film, revealed on The Ellen DeGeneres Show, Renner actually broke both of his arms just three days into filming. "We had 40 more days to go," Hamm explained.
He went on to explain that instead of waiting for his arms to heal, Renner wore "green screen casts that were ... eventually painted out in the edit." Wow, it's pretty impressive that Renner managed to keep filming this action flick with not one but two casts!
It's also a pretty impressive editing job. Of course, it wasn't completely perfect. As The Ringer noted, Renner frequently wore long sleeves to cover his casts. And in one shot, his cast is clearly visible. And when the CGI team did try to recreate his arms, they sometimes looked a little, well, fake.
