Article continues below advertisementKevin Costner nursed a lifelong admiration for the late star Rob Reiner, which OK! can reveal stemmed from the iconic filmmaker stepping in to dramatically fix one of the A-lister's "broken" movies.Reiner, 78, who was allegedly slaughtered by his son Nick Reiner, 32, on December 14, alongside his wife Michele Singer Reiner, was seen by Costner as a workmanlike director who could step in and sort other people's mistakes with a snap of his fingers.