Comfort and Convenience
Cabin temperature is the classic point of disagreement: what feels pleasant to a driver in a jacket can feel cool to someone sitting still in the back. Preferences differ with clothing, activity and simple habit.
Safety and Driver Assistance
Learning where the essential controls sit, lights, wipers, mirrors and the hazard switch, is worth doing while parked rather than mid-journey. Passengers also benefit when the driver is not searching for something at an awkward moment.
Multimedia and Connectivity
Battery level on a long trip is a common worry, so knowing in advance whether a phone can be charged aboard, and with which cable, saves improvising. Calls and music are separate questions from power.