Retta Mom Actor Chris Pine Westley Actor Josh Gad Grandson Actor Rob Reiner Grandfather Actor Tiffany Haddish Princess Buttercup Actor Common Westley Actor Hugh Jackman Prince Humperdink Actor Rainn Wilson Vizzini Actor Jason Segel Fezzik Actor Mackenzie Davis Princess Buttercup Actor Nick Kroll Vizzini, Inigo Montoya, Fezzik Actor Jason Reitman Director Nathan Orloff Film Editor Jeffrey Katzenberg Executive Producer Van Toffler Executive Producer Jason Blumenfeld Producer Erica Mills Producer