10 Genius Ways Movies Fixed Their Own Mistakes

10. Jeremy Renner Got CGI Arms After Breaking Them - Tag

While filming a stunt for last year's comedy film Tag, in which he surfs down a stack of chairs, Jeremy Renner broke both of his arms when the rigging holding up the chair's broke, causing him to fall to the floor.

Despite initially having no idea he'd sustained any serious injuries and even performing a second take of the sequence, Renner eventually went to the hospital, where he learned of the breakage and had both of his arms put in casts.

The actor soon returned to set and continued to perform scenes as best possible, requiring the film's VFX team to take on an additional task: painting out Renner's broken arms and replacing them digitally.

For the job, Renner had to wear green sleeves over his casts to make the post-production task easier, and impressively, it's incredibly difficult to notice the CGI arms in the end result.