--The interior handles on the front doors electronically open the door; if you continue pulling them all the way, a cable engages and unlocks the door in case of power loss

--The rear door latch is in the body frame and not the door. Therefore, in the event of power loss, there's something to pull on under the seat which will open the door

--There's no way to get into the car if it's 12V system completely fails (note that this is NOT the same as running out of range). Unlike the Roadster which has a keyhole in the bottom of the door. This would be an extremely rare situation (and has been on the Roadster, which has an inferior system)