For #1 I'm guessing timing belt auto tensioner. Try poping the hood and place your head near the timing belt and have the motor rev up and then drop back to idle. If the sound happens when the revs drop and it's coming from that area I'd be willing to bet that's it. There was a TSB issued for that but since you're out of warranty I'm not sure what the dealer will do for you. The other two seem to be the typical rattles and shakes the preludes have.