Hoffman has been widely reported in different media to have harassed Streep during the making of the movie, and the two had a contentious working relationship as a result. In a 1979 Time magazine interview, Streep claimed that Hoffman groped her breast on their first meeting. The two actors battled over their characters, with Streep wanting to portray Joanna as more sympathetic and vulnerable than she was written. As a famously committed method actor, Hoffman would also hurl insults and obscenities at Streep, taunting her with the name of her recently deceased fiancé, John Cazale, to draw a better performance out of her. He famously threw a wine glass against the wall without telling her (although he did inform the cameraman beforehand), which shattered and sent glass shards into her hair. Her response was: "Next time you do that, I'd appreciate you letting me know."
In 2018, Streep told The New York Times that Hoffman had slapped her hard without warning while filming a scene: "This was my first movie, and it was my first take in my first movie, and he just slapped me. And you see it in the movie. It was overstepping."