Can I get a waiver for out-of-state subpoena from Pennsylvania county court ?

My colleague made some good points. You may consult a D.C. or PA defense attorney, too.

What proof do I need ?

Follow the suggestions of my NY colleagues.

Can my son get in trouble , such as disorderly conduct, for a fight in our neighborhood park?

There IS something you can do. Hire a criminal defense attorney for your son.

Short answer is yes, you can be so ticketed, so hire a defense lawyer asap.

Can I get a ticket thrown out?

Possibly, although all mistakes on a ticket are not critical. Consult a defense lawyer in MO.

Will my failure to appear be dismissed after I paid the fines at gc services?

Consult a defense attorney in your area.

Indiana dept of correction

You are right, so consult an experienced IN criminal defense attorney.

Is it illegal for a minor to view a sex tape of two adults?

Probably not, but the adults will. See the earlier post by my PA colleague.

Can a 16yr old female and a 19yr old male have imtimate relations?

No! Danger! Danger! Read closely and follow exactly the suggestions made earlier by my colleagues.

Technically, even if you can, it is getting close to the danger zone, especially if sex is involved.