Some people have been fined for having shopping on the back seat instead of in the boot. I suppose the thinking behind that is that the shopping could fall down and roll under the seat. I think most of these Laws or fines are safety related but it also seems that some officers take them to the extreme.
Examples, your driving alone but could be fined for not having the same amount of reflective jackets as seats in the car.
Driving in flip flops, dangerous same as driving in bare feet. Now you could be fined for wearing backless shoes. The sandals I wear are just as safe as one's which have straps on. In fact safer as nomally strappy sandals are quite flimsy and your feet could slip off the pedals. On my last trip out I managed to do an emergency stop when a tiny dog appeared on the road in front of me so I know they are.
In our area people have also been fined for using mobile phones when they haven't.