There's a bunch, but I cannot remember them all. I was one of the kids skateboarding (Iwas 14)on PCH in Cheech and Chong's Up in Smoke, in one of the nightclub scenes in Valley Girl and also in the Lost Boys, and the most recent one was in the back ground of the hotel lobby in Harrison Ford's Hollywood Homicide.
By the way, the guy (Danny Moder) that married Julia Roberts, I taught his older brother (John) to surf. Spent almost every weekend of my summers at their Paradise Cove (Malibu) home. Their dad is Mike Moder. He did many TV series like Matlock, and a few big movies, biggest one I can remember was Jeremiah Johnson, starring Robert Redford. His oldest daughter, Jane (what a FOXXXX!!!) was also in Cheech and Chong's Up in Smoke. She was the girl that was hitchhiking with a friend (both looking REAL sexy from the rear with long blond hair) when the two stoners pass them, then turn around, only to discover that it was really two guys with real long hair. (Did I mention she was a FOXXXXX!!!)
Oh, and I was in PeeWee Herman's Big adventure, his first movie. Most of that movie was shot in downtown Santa Monica (Dogtown!). The bike shop where PeeWee worked and had his bike stolen was an actual bike shop. The girl that played his supposed girlfriend also played in Valley Girl. She was dating my friend's older brother at the time. I could tell stories. She was as saucy as she looked.