I have had same salesman for many cars, he spends lots of time setting up 'fiddly' bits and my preferences. this was great with test drive on Crosstar with its quite radical changes (for me) to driving habits with automatic system and able to concentrate on great driving experience.
Other than that a good visual examination of all outside paintwork and inside panels, facia.
One car from dealer had a tiny almost undetectable ding on roof - they gave me the option of taking or reject, which I did, they then negotated with Honda for discount to be passed on to customer who accepted very minor defect.
Only once had scratch on top of dashboard which i detected on way hpme after delivery - looked like a consequence of cleaning tool or sign removal - turned round to gargae and top part change a week later.
About 15 new Hondas now and that is only 'problems' so far.
Over 10000 miles in Crosstar - possibly best one ever had overall.