Corrected entry: 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.
Corrected entry: 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.
Correction: It's entirely plausible that Anita is unfamiliar with Stillwater or is only mildly aware of them. As the title implies, they are, "Almost Famous." Anita may only have followed the biggest bands of the era and was uninterested in an upcoming "mid-level" band as "Rolling Stone" magazine describes them. William may have told her about his adventures on the road with them, but that does not mean she knows what the band members look like. She's also been a flight attendant for a few years, and may not follow rock bands as when she was teenager. Stillwater was not even a notable mid-level band when Anita left home.
Correction: It was never said that Anita had not been home since she left at the beginning of the movie. Even though she and her mother had a strained relationship, she would likely have been back for short visits.
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