Prop culture is finally having its moment. Just a few decades ago, key items from even such legendary movies as “Star Wars” were often thrown aside or tucked into someone’s pockets after filming wrapped. But the new documentary “Mad Props” follows Tom Biolchini, a banker from Tulsa, Oklahoma, as he scours the world for the coolest authenticated props and advocates for them to be viewed as luxury collectibles. “Back in the day, the studio would say something like, ‘Oh that Darth Vader outfit, maybe we can use it another time’ [and keep it in a store room],” Biolchini told The...