When Penny Lane asks William to go with her to "wherever", she asks him twice. The first time William didn't like the way he said it, so he asked her to ask him again while the cameras were still rolling. Cameron Crowe like it so much that he kept the entire sequence in the film. See more...
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Factual error: This is a wardrobe error... in the next morning scene after William has been deflowered, he is still in his Fruit of the Looms, which have the name printed on the elastic waistband. Fruit of the Loom did not print their name on waistbands like this until the 90s, in the 70s they just had single blue and yellow stripes.
Continuity: In the scene where William is sitting in the tub working on his notes, after Penny comes in and sits on the toilet, he scrambles out of the tub and most of the notes which were on the side of the tub fall on the floor. In the next cut when the camera is positioned near the bathroom door, looking in, all of the notes are back on the side of the tub and none are on the floor.
Other: Penny Lane picks up William to go see Stillwater at the Riot Club in L.A. In the very beginning of the scene in her car, a reflection passes up the windshield over William's face as they are driving. The Reflection is the prism and spectrum from Pink Floyd's "Dark Side of the Moon" album. There are no other reflections in this scene.
Other: When Russell Hammond goes to William's house he spots a professional photo of William and his sister Anita. The photo shows William as a 15 year old with his sister. But Anita has been away working as a stewardess, and has not seen William since he was 11 - who was played by a younger and different actor in those scenes.
Audio problem: When the band is in the limo coming into NYC, Jimmy Fallon gives the band a quick pep talk (e.g., "all you can do is be yourself and leave a pint of blood on the stage"). When the shot changes from inside the limo to outside the limo, the audio does not match the movements of Jimmy Fallon's mouth.
Factual error: When William runs into the street to look for Penny Lane, he runs between a row of taxi cabs. Across the street is a blue mid 90's model GMC Suburban. Since the scene takes place in 1973, this is obviously a mistake. It may be necessary to use zoom, depending on the size of your screen.
Continuity: In the scene where the man jumps off the roof into the pool, you can see that two people from the top left corner jump into the water to save him; then in the next shot you can see that no one has jumped in because the surface of the water is undisturbed and then the same people jump in again.
Continuity: Backstage at the first concert, William is sitting alone writing when Penny comes to talk to him. She has her glasses in her hand as she frames his face to guess his age. As the scene is shown from different angles, she is shown both with the glasses in her hand and without them in her hand depending on the shot.
Plot hole: In the scene when Russell comes to William's house, thinking it is Penny's, confusion ensues as he begins to question where he is. William's sister, Anita, stands there equally confused as she gazes at Russell, looking as if any random person came to the house, showing no signs (neither speechless shock nor excitement) of recognizing the now famous rock star. Her reaction is completely inconsistent with her character given her fervent love for rock 'n roll. Indeed, not only did she serve as the sole catalyst for William's passion for rock 'n roll but she left home earlier in the film because their mother forbade her listening to it. Moreover, she'd just flown home with William following William's long tour with Russell and Stillwater. Thus, there is no credible possibility that she would not recognize Russell, making her reaction wholly inconsistent with her character.