James Caan’s time on the set of The Godfather (1972) was defined by high-energy improvisation, a playful “prankster” reputation shared with co-stars, and some genuine tension during physical scenes. Though he was originally considered for the role of Michael Corleone, director Francis Ford Coppola and Caan himself pushed for Al Pacino, allowing Caan to play the hot-headed Sonny.
During the wedding scene, Caan spontaneously smashed an FBI photographer’s camera. He then threw money at the photographer because, as he put it, in his neighborhood “if you broke something, you replaced it.”
Sonny’s famous “bada bing” line was an ad-lib inspired by the comedian Don Rickles, whom Caan used as a loose model for Sonny’s driving energy. In the fight with Carlo Rizzi, Caan decided to throw a sawed-off broomstick at his co-star, which was not in the script.
To cut through the intense atmosphere on set, Caan and Robert Duvall began a contest of “mooning” the cast and crew. This culminated in Marlon Brando and Duvall mooning 400 people during the wedding scene, for which Brando was jokingly awarded a “Moon Champion” belt.
Gianni Russo, who played Carlo, claimed Caan took their on-screen rivalry into reality, alleging Caan actually broke two of his ribs and chipped his elbow during their fight scene. Caan later dismissed these claims, stating he mostly performed the scene with a stuntman.
Filming Sonny’s death required 147 squibs, more than the veteran technician had ever used in 50 years. Caan recalled being genuinely terrified during the stunt due to the amount of flying glass and wood.
Caan was initially furious after seeing the film for the first time because Coppola had cut roughly 10 pages of Sonny’s character-building scenes to keep the runtime under three hours.
Co-star Robert Duvall recalled that Caan made filming genuinely funny, even in serious scenes like the one where Vito examines Sonny's corpse. Despite all the on-set drama and mischief, the role officially made Caan a movie star, earning him an Academy Award nomination and producing a performance that invited audiences to reconsider what screen tough guys could be.





































