Goofs

When Olive tries to right her wrongs, she talks to Evan in an ice cream parlor to persuade Evan to tell the truth. When Evan refuses, Olive crushes an ice cream cone but, in the next shot the cone she crushed is still there.

When Olive stands at the door claiming Mr Griffith wanted to see her, the 'A' is on the left side of her chest. When he confirms, she walks across the room with the 'A' on the right side. She sits down at the desk and the 'A' appears back on the left side.

While preparing to have "sex" with Brandon in the bedroom at the party, Olive is seen taking off her right boot twice but is not seen taking off her left boot.

After the scene of Olive and Rhiannon sitting on top of the yellow car, the voice over of Emma Stone says "The next day, things took a turn for the scandalous." yet the very next scene Olive and Brandon are both wearing the exact same clothes from the "previous" day.

When Todd gets out of the pool to talk to Olive, his shoulders are dry and in the next cut they are dripping wet again

During the montage scene Chris gives Olive $40 in gift certificates for a movie theatre, which she mentions will expire in her voice-over. Per California law since 1997, gift certificates based on a dollar value cannot expire.

During the first scene with the English teacher, he spells "judgment" as the British spelling "judgement", even though he is American. However, this is part of a lesson about The Scarlet Letter, which is written in 17th-century English idiom.

Micah's age, as described by the other characters, changes from 22 to 20. The first reference (to 22) was probably hyperbole, with the later explanation being official and precise.

When Brandon and Olive are in her bedroom, the desktop on her computer shows Olive and Rhiannon from afar. However, in another shot afterwords it appears to be a closeup of the same picture. When talking with her mother when getting the gift from Brandon, the picture changes a lot, but if you watch closely, when her mother is saying her father is a little too straight, you can see her background image change, so it rotates through different pictures.

Not only Catholic priests (who are celibate) wear collars. Many pastors/preachers in other denominations wear some form of a clerical collar. Thus, Marianne's dad could be wearing such a collar.

As Todd is driving Olive home, you can see the speedometer as they drive down Olive's street. Even though they are clearly moving, the speedometer says 0 MPH (miles per hour).

When Olive is doing the live broadcast near the end of the film, her screen is visible and it shows "Start Broadcast" multiple times, indicating that she isn't currently broadcasting anything.

There are jump-cuts in Olive's broadcast, which shouldn't be possible when broadcasting live.

When Todd stands on top of the lawn mower playing "Don't You (Forget About Me)" through the speakers at the end of the movie, they appear to play when they are, in fact, not plugged into anything and are seen dangling freely in many shots.

When Olive and Brandon are pretending to have sex, both times Olive slaps Brandon, slapping sounds can be heard when she isn't actually hitting him.

In the end credits, as the camera continues down the street, at the end, you can see a City of Ojai police officer stopping traffic from the opposite end to allow the filming.

In one of the first scenes with Olive and Rhiannon, where they are walking down a school hallway, a mic belt can be seen on Olive's shirt. Emma Stone herself pointed this out in the DVD commentary for IMDb's benefit.

At the beginning of the movie, when Olive and Rhiannon are walking down the main street of Ojai (the street with all the arches) you can plainly see the California Highway Patrol car and the officer holding traffic at the intersection to keep traffic off the street while filming.

In the last pep rally scene in the gym, when a shot cuts to Rhiannon, her face is obstructed by a lens flare (like a rainbow) created by the camera lens.

Olive mentions her fake boyfriend at the beginning of the movie who goes to the same college as her brother, but the brother is never mentioned again.

Olive refers to the 1934 version of The Scarlet Letter (1934) as "the original". The original feature length film is actually the 1926 silent film The Scarlet Letter (1926).

Two of Olive's handwritten webcast signs are missing commas (to close parenthetical thoughts), right after the phrases "however totally false" (near the start) and "Olive Penderghast" (near the end).