The film is also (very loosely) based on "The Scarlet Letter," which winds up being less an inspiration for the plot and more a source for one of the film's funniest gags wherein various characters mockingly refer to the 1995 adaptation of the novel starring Demi Moore.
But this is, after all, a high school flick inspired by Nathaniel Hawthorne's "The Scarlet Letter," so even though I didn't really buy the words coming out of the mouth of a precocious 17-year-old, I still enjoyed knowing somebody uttered them.
Nathaniel Hawthorne’s The Scarlet Letter inspires the high-school comedy Easy A, in which Olive (Emma Stone) finds herself excoriated by the entire student body when word mistakenly gets out that she is the campus harlot.
Here he adolescentizes The Scarlet Letter; the title refers to the stigmatic A for Adultery worn by Nathaniel Hawthorne's Hester Prynne.
The reference, of course, is Hawthorne's "The Scarlet Letter," which she's reading in a class taught by the school's coolest teacher (Thomas Haden Church, in perfect casting).
Not only does it contain various literary references to Sylvia Plath, Mark Twain and Nathaniel Hawthorne (whose novel The Scarlet Letter forms the basis of Easy A ) but it also mentions Judy Blume, Say Anything… and all of John Hughes’s films.