I'm on a community Youth Aid Panel which works with kids to keep them from getting a record. I see youth (14 to 17) with minor arrests which would keep them out of some schools, jobs, etc. if they went through the courts. The community has to have a YAP and the arresting officer and victim have to agree to put the youth through this program instead of through the court system. If they complete the program, they have no record.
These are some things we've had which would be considered minor but still give them a record:
1. Smashing mailboxes or other minor destruction of property
2. Graffitti
3. Attending a party where there is underage drinking marijuana/ or being arrested for underage drinking/marijuana (not if a car is involved, though). Pennsylvania is a guilt-by-association state, so just attending a party where there are drugs or underage drinking is an offense. Most kids don't even know that.
4. Petty theft (like make-up from a drugstore or something from a neighbor's garage or yard)
5. Trespassing
That's off the top of my head. If you need more, let me know.