The knob could stick due to dust or something being spilled around it. The knob should be able to be removed, and the area under it cleaned.
Probably down the dip stick tube.
Some stereo systems coming with Camry have auto-theft protection code, it means if you disconnect battery or the stereo itself, you will have enter a code when you power it on. If you do not that code you might have some hard times unblocking the stereo. Also some people have problems with fuses after battery change. Thus the fuse boxes.
I would guess No, very few stock units have aux inputs unless marked on the front
You have overfilled the engine. Drain the oil to the appropriated level.
The 2000 Toyota Camry is about 5,000 pounds, if not that, more!
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Crime in Stereo was created in 2000.
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