I can’t see how the parking brake event would affect the accel pedal. More likely those are separate issues. The accel pedal is actually an assembly of parts, and so something could easily come loose, like a bolt, or a spring, and cause that looseness feel. A shop that specializes in Jeeps should have no trouble to fix the accel pedal problem. Be aware that until you get it fixed, you may find yourself stranded, or worse, unable to slow the engine down if it fails entirely. So some urgency is needed in getting the repair done.
On some newer cars the accel pedal ass’y has a small computer too, so it can be costly to replace if that’s needed.
The parking brake noise is probably just that the mating parts are a little rusty and what you heard was the rust being ground off. If the parking brake continues to work as before, I wouldn’t worry about that.