Twin Peaks: Fire Walk With Me depicts the last seven days of Laura Palmer's life, leading up to the discovery of her corpse that begins the series.
Most of the action of FWWM seems consistent with what we learn about Laura and her circle of friends in seasons 1 & 2. For example, in the series, Shelly tells the FBI that she helped Laura with Wheels on Meals, and FWWM obliges with a scene where they do that together.
But one difference seems to stand out. My recollection is that in the TV series, Donna Hayward (played by Lara Flynn Boyle) was a "good girl" who, despite being Laura's best friend, wasn't involved in the darker aspects of her life, perhaps even unaware of them. But in FWWM (where she is played by Moira Kelly), Donna accompanies Laura on a trip to Canada, and both witnesses and takes part in Laura's drug use and prostitution. The climax of this scene comes when Ronnette Pulaski exclaims, "is that Donna Hayward?!", sending Laura into a frenzy.
So, IS that Donna Hayward? Did Lynch use the re-casting of the actress as an opportunity to turn Donna into a darker character? Or is my recollection of the TV show version of Donna wrong?