Just noticed a weird one - may be intentional from BMWs part or not, but when your kids play with the cabin lights in the back and leave ONE side on, you can tell which one directly when you unlock the car - the light in the OFF position will 'warm up' more slowly than a light that was left 'on' which hits full brightness immediately when the car is unlocked.

Have owned the car for almost 4 years and just noticed.... :P

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2006 X5 4.8iS (facelift) in Imolarot + Ivory leather & alcantara headliner
1999 E46 323i in Imolarot II + Grey nappa
1990 E30 320iSE Sterlingsilber