| Errors | Missing | Unverified | Supported |
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| 2 | 1 | 0 | 2 |
While Sideways (2004) is famously known for its Academy Award-winning screenplay by Alexander Payne and Jim Taylor, the film allowed for specific pockets of improvisation, particularly to enhance the chemistry between the two leads, Paul Giamatti (Miles) and Thomas Haden Church (Jack).
The following scenes and sequences involved improvisation or significant ad-libbing:
The shooting script for Sideways explicitly labeled many sequences as "improvised." According to the film's editor, Kevin Tent, and the published screenplay, whenever the characters are seen talking while music plays or during a montage (such as the wine-tasting tour sequences), the actors were instructed to ad-lib their conversations.
During the double date scene with Maya (Virginia Madsen) and Stephanie (Sandra Oh), Thomas Haden Church improvised several of Jack’s desperate attempts to keep the evening going.
Thomas Haden Church has noted that director Alexander Payne used a "found" approach for the comedic-yet-tragic scene outside the restaurant where Jack laments his situation.
Paul Giamatti has stated in multiple interviews that he tended to "toe the line" of the script because it was so well-written, but that Thomas Haden Church was a prolific ad-libber.
Contrary to popular belief, the film's most famous line—"I am not drinking any fucking Merlot!"—was not improvised.
The summary fails to distinguish that Alexander Payne often incorporated Church's 'ad-libs' into the script *during rehearsals* rather than them being purely spontaneous on-set inventions. Payne has stated, 'most of those things appeared before shooting began, and I put them into the script.'
In Sideways (2004), while the screenplay by Alexander Payne and Jim Taylor was strictly adhered to for the most part, there were specific instances of improvisation. Verified improvised moments include the background dialogue during montages (such as the dinner scene), which the script explicitly labeled as "improvised" to create a naturalistic feel. Thomas Haden Church was known for generating many ad-libs (like "get your bone smooched"), but director Alexander Payne noted that most of these were developed during rehearsals and then written into the script before shooting, rather than being invented on the spot during takes. The famous "I am not drinking any fucking Merlot!" line was not improvised; it is verbatim from Rex Pickett's novel. Claims about specific outtakes involving "kooky queso" or a "Gilligan jukebox" are unverified.