i was worried about this too when i had to turn in my 98 JGC for the MDX.... it varies per leasing company and really depends on the person that appraises it.... scheduled maintenance will not be an issue unless the car has internal problems... then they may want you to prove that you followed the schedule in the manual(save those receipts)..... minor door dings, scratches, stains that can be shampooed out are considered normal wear and tear so u wont get charged.... obvious damage to the paint, big dents etc you will get charged for.... the rule of thumb you should use is if you were gonna buy the same car you're turning in, would you make a stink over the door dings or other damage or could u deal with it??? if you would ask for money off the price, then you can expect the lease company to charge you for that damage... after much worrying and preparation(took pictures with digital camera and real camera, and videotaped entire car and engine including footage of me operating every single feature) i wasnt charged anything except the termination fee....
i did pay for the front bumper to be replaced since i was pretty sure they would bang me on that but everything else was considered normal wear and tear and I had several door dings, some minor scratches, cigarette burns in the carpet, etc..... hope this info helps.... best of luck