What features that should be obvious are not and other gadgets are a complete mystery, such as the electronic parking aids that warns you if you're in danger of scraping the curb or hitting a barrier.

Solution: Don't leave the lot until you've thoroughly familiarized yourself with the workings of your car, especially its safety features: brakes, mirrors, turn signals, car horn, seatbelts, wipers, de-foggers, car locks, windows, trunk lock, etc. Check the glovebox for the car manual and look up any unfamiliar features. If you're confused, ask for assistance at the rental office before you leave.