There's a mild amount of suspenseful music in the movie. You know you want me to give it to you. Marty tells George about his plan to get him to rescue Lorraine from Marty's staged advances. Later in a parked car with Marty, Lorraine tells him that she likes to park and that it's not her first time. Lorraine shows some cleavage in her low-cut dance dress.
Some musicians get out of a smokey car.
Some students smoke outside a dance. School bullies and standing up to them. Several terrorists show up and shoot Doc Brown with a machine gun and then chase Marty and shoot at him as well and crash their van into a small building. Marty is hit by a car and knocked unconscious. Lorraine smacks Biff for pawing at her.