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Based on internal knowledge of the production of The Wolf of Wall Street, the answer is yes. Rob Reiner, who played Jordan Belfort’s father, Max Belfort (nicknamed "Mad Max"), heavily improvised many of his lines and reactions.
Martin Scorsese is well-known for encouraging a high degree of improvisation on his sets, particularly in his collaborations with Leonardo DiCaprio and Jonah Hill. Rob Reiner, being an experienced director and comedic actor himself (with deep roots in improvisation from projects like This is Spinal Tap), fit naturally into this environment.
Here are specific details regarding his improvisation in the film:
One of the most notable areas of improvisation involved the friction between Max Belfort and Donnie Azoff. In the scenes where Max is attempting to act as the "voice of reason" (or at least the voice of financial restraint) in the office, Reiner and Jonah Hill riffed extensively. Specifically, the scene where Max is yelling about the excessive spending on credit cards and the "sideshow" atmosphere of the office was largely developed through spontaneous back-and-forth.
Reiner’s character is defined by a hair-trigger temper. Many of the specific insults and the high-pitched "Mad Max" screams were not strictly scripted. Reiner has noted in interviews that Scorsese would often let the camera roll and simply tell Reiner to "get angry" or "react to their stupidity." This led to the repetitive, sputtering rage that became the character’s trademark.
There is a scene where Max is sitting in his robe, complaining about the cost of things and his general lifestyle while Jordan (DiCaprio) talks to him. Much of the dialogue regarding the trivialities of their daily lives—such as Max’s complaints about a "shave" or the price of items—was improvised to establish a "lived-in" father-son dynamic. DiCaprio and Reiner spent a significant amount of time "riffing" on the absurdity of the Belforts' wealth versus Max’s old-school, frugal mindset.
Because DiCaprio and Reiner developed a strong rapport, Scorsese allowed them to talk over one another, which is a hallmark of the film's frantic energy. In the scenes where Max is criticizing Jordan's legal troubles or his marriage, the overlapping dialogue—where Max interrupts Jordan with insults or dismissive "un-huhs"—was created on the spot to make the relationship feel more authentic and dysfunctional.
While Terence Winter wrote a highly detailed script, the "Scorsese Method" used on Wolf of Wall Street involved:
Rob Reiner’s performance is considered one of the highlights of the film specifically because his improvisational background allowed him to keep up with the high-energy ad-libbing of DiCaprio and Hill.
The AI missed the actual content of the improvised lines: 'sides cure cancer' (cost) and 'no bush?' (shaved women), instead inventing a complaint about a facial shave.
Yes, Rob Reiner heavily improvised his scenes in The Wolf of Wall Street, particularly in his interactions with Jonah Hill and Leonardo DiCaprio. Reiner has cited the "sides cure cancer" exchange—where Max Belfort questions a $26,000 dinner receipt—as a key example of improvisation developed with Hill. Additionally, the scene where Max and Jordan discuss women being "shaved" (referring to pubic hair) features improvised reactions, such as Max's admission, "I don't mind it." The AI summary incorrectly describes a scene where Max complains about a "shave" (facial hair) while in a robe; this is a conflation of the "sides" (cost) and "shaved" (women) dialogues.