Besides the emblem of course. Body lift? Tow hooks? Skid plates? etc. Just bought it. Can you tell if it's lifted? I don't see tow hooks and haven't checked for skid plates yet.
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Your 2006 Sport looks exactly like my 2006 Sport - nice choice

Yours looks to be in great condition. The Sport was the basic trim level in the day, not much extra.V-6, AT, power windows/locks, AC, key fob locking, with basic cloth seating surfaces. No cruise or anything like that. All in all a very functional vehicle. The "Trail Rated" thing is a sales gimmick Jeep still uses on many of their vehicles. I bought mine to tow behind my motor home, Liberty's are the perfect toad - transfer case in neutral, AT in park, key to unlock position and off you go. Once to your destination you have a vehicle that can comfortably carry 4 adults, go on the beach, some off-road trails and it does well in snow. Mine has been towed 1000's of miles; to Alaska and back, multiple trips to both coasts and many places in between. The Libby has been ultra reliable, just basic maintenance. Things like tires, batteries, brakes, O2 sensors, change oil/filter differential fluids on a regular basis and it keeps going.
It looks like I have the same wheels as you have, not the stock steel wheels in the picture. Hope your Liberty serves you as well as mine has,