The Godfather (1972)
How to make Don Corleone look like a bulldog
Marlon Brando aimed to give Don Corleone a distinctive appearance, and make him look like a bulldog, so he stuffed his cheeks with cotton wool for the audition. A dentist later crafted a mouthpiece for the actual filming.This prosthetic mouth is now on display in the Academy Museum of Motion Pictures in Los Angeles.
How tu turn Don Corleone into a Spectre villain
The cat Marlon Brando held in the opening scene wasn't part of the original script. Coppola found it as a stray on the Paramount Pictures lot. Enjoying Marlon Brando's cuddles, the cat purred so much that it muffled his dialogue and, as a result, most of his lines had to be looped.
How Mario Puzo almost got Frank Sinatra under his skin
Although the writer Mario Puzo explicitly stated he didn't draw inspiration from Sinatra for the Johnny Fontaine character, it was widely believed otherwise. Furious about that, Sinatra confronted Puzo at a restaurant, using explicit language and making threats. As a result of Sinatra's objections, Fontaine's character was significantly reduced to only a few scenes.