The main thing to look for is rust and structural anomolies! Most mechanical issues can be resolved pretty reasonably. It helps to have a flashlight with you. Check out the shock towers, look through the glove box, look in the trunk around the spare tire well, remove rear seat if possible. Also, the owner did not show pics of the engine bay. What is the condition? Does it look like there has been any overheating problems? Check out the hoses, belts, and signs of fluid leaks of any kind. If you can get digital pics of any of these things that would be helpful as well.