Continuity mistake: When Cher is laying on the bed watching a movie with Christian, he gets up. He is lying with his face down, but in the next shot he's lying on his back right before getting up and walking towards the door.
Continuity mistake: At the valley party, after Travis tries to see how Tai is while she's laid out on the counter, Cher pushes him all the way out of the kitchen so that his entire body is in the doorframe. In the next shot, he is several steps back into the kitchen as he turns to go back into the other room.
Continuity mistake: When Cher's driving instructor tells her she failed her test, the instructor is sitting next to her, then we see a brief shot of Cher crying, then we see the instructor out of the car and at the front of it. The camera wasn't off him long enough for him to get out of the car and walk that far, and we didn't hear a door opening or closing.
Character mistake: Circus Liquor is actually located in North Hollywood, not Sun Valley (although Sun Valley is just a few short miles away from there).
Answer: Malibu is a hazardous place to live. It's constantly threatened by wildfires, which burn out the underbrush. Then when it rains, there's nothing on the ground to keep the mud from sliding down the hills, so mudslides are a problem, too. She was probably referring to one of the many times that this has happened.
Krista