Plot hole: After Cher is robbed, and calls Josh to get a ride home, she does not tell him where to pick her up. She just says she's in Sun Valley.
Suggested correction: Well it cut to when she was in the car with him. Maybe she called him again later offscreen to tell him where exactly she was or maybe he guessed where she was (maybe she had told him another time where she usually goes in Sun Valley).
Continuity mistake: At the party Tai, Cher, Josh and Christian are at, Tai asks Cher what to do with her shirt and Cher tells her to tie it around her waist. The film cuts to the band and when it cuts back to Tai, she's wearing her shirt again. The film again cuts to something else and when it cuts to Tai she isn't wearing the shirt, nor is it tied around her waist.
Suggested correction: It is not exact cuts. Tai is standing there being ignored and she's trying to put her shirt on in different ways to attract attention. She went from wearing it open to tying it around her waist to putting it on and tying it just under her bustline to tying it around her head to finally just wearing it open.
Other mistake: Near the start when Cher asks Tai how old she is, Tai says, 'I'll be 16 in May.' Then Cher says, 'Well, my birthday is in April, so as someone older than you...' But throughout the movie it is said that Cher is already 16. No birthdays are shown. You'd think that a rich girl in Beverly Hills would celebrate her birthday.