Replaced suspension components, difference in color shades between panels, body gaps should all be even, rust on front fender arches (there's a TSB for free replacement for rust thru), even wear on all 4 tires, pull the engine cover and look for leaks, look to see if there's still a plastic lower belly pan, smoothness of shifting, brake rotors (grooving), pull the e brake (before test drive) to see if it releases like it should (then feel for excessive heat from rear wheels after drive), coolant color (should be bright pink), at around 55 on a smooth road take both hands off the wheel and see how the car tracks, brake hard from 55 to 30 to see if the car lurches one way or stops straight (and no brake shimmy), and pull the top timing belt cover back and have a little looky loo... Good luck!!
I'm no expert, just a car guy who's got an eye for detail and relatives ask me to look at used cars for them...