For the film, a number of changes were made to the "Saltburn" estate. These included the shared bathroom connecting Felix and Oliver's rooms, with a bath made especially to accommodate Jacob Elordi's 6' 5" frame.
During rehearsals, Rosamund Pike and Carey Mulligan improvised the conversation they have in their introductory scene. Emerald Fennell found it funny, so she added it to the final screenplay. Similarly, Pike joked to Fennell that her character secretly thought 'Common People' by Pulp was written about her, which inspired some of the final dialogue in her sunbathing scene.
Some of the film's marketing included intentionally short clips lasting less than 15 seconds, which were designed to act as 'tasters' for the film and give away much less than a conventional trailer or even a teaser. This was the idea of producer Margot Robbie, who wanted to maintain an element of mystery about the film and not show too much before the viewer had the chance to experience the whole film.