The door interior handle trim tends to break on these cars, speed sensors, paint flaking off of hubcaps (LX, DX models), squeaky front suspension, cassette/radio problems, harsh/noisy shifting automatics. Luckily, rust has not been a problem on my car, as it is a problem spot around the rear wheel wells on the Accords. My car had developed a few rattles and "popping" noises in the dash area and door panels, but again, for a 11 year old car and 169K, not too bad.
Dash layout, quality of some interior materials, exterior design, fuel mileage.
Improved quality of some interior plastics, better suspension, better radio, (which can be fixed by installing a aftermarket system), softer ride, more power.