All right, an update on my passport application appointment earlier today. Went in, gave my paperwork, and paid around $167.00 via card (apparently, they allow you to use a card, but they have to charge around a $2.00 money order fee since it does need to be sent to the US Department of State) and that was that.
El Barto, as for parking at the Greek Theater after I saw Goo Goo Dolls today, here's how parking at the shuttle area work. There are two parking lots. One that serves as a regular parking lot for a Pony Ride service for children by day and a dirt lot next to the other lot. You can park at the non-dirt lot after around 4 PM and it's better to park there than the dirt lot. The first shuttle comes around after 5:00 PM (or roughly 2.5 hours before the first band starts). You give the printed parking pass you buy for $10.00 to someone that can scan it. They will give you a wristband so that you can get in the shuttle after the show ends and they give you a slip to put in the car in so that it will be in plain sight. Afterwards, it will be a 15 minute ride from the lot to theater (of course, it varies due to being in a LA area on an afternoon). Then, the driver will tell you where the shuttle to go back to the parking lot will be at when you get to the theater. They told me the last shuttle goes out at 11:15. I got into one at 10:45 and it took 10 minutes to go from theater to back to the parking lot (could be more, since I left after the band finish their main set and not after the encore. The drive could take more time as people are leaving). Afterwards, you exit out right and the 5 South Freeway entrance should be nearby on your right.
I will suggest parking and taking the shuttle as driving down a hill at night in a park area that's pretty darn pitch black is pretty risky, but that's just me.