Hmmm....
My grandparents had some paraffin stove heaters, but never stored the jerrycans in the house. Indeed it was quite a solemn ceremony (to my young eyes at least) for grandad to go to his shed and retrieve the cans in order to replenish the heaters. It was certainly never conducted when (a) he was smoking his pipe (b) when any of the open coal fires in the house were lit (c) when my grandmother was using the electric cooker.
I’m not sure that paraffin was something commonly stored in peoples homes. Commonly used, yes, but not commonly stored indoors.
It was always fun when you got something from the department store and they'd pull you off about five books-worth from the roll.
Heh, my memories go back as far as the 1970s oil crisis and the effect that had on filling stations, many of whom would offer double or treble Green Shield stamps as a customer incentive. When petrol prices soared these stations offered 10, 20 or even 30-fold stamps, which meant even buying just a couple of gallons led to reams of the things chuntering out of the issuing machine!
Maybe not especially commonplace, but I remember some very kitsch (to current tastes) ornaments being around in the late 70s, early 80s. I used to look in the window of our local electrical retailer at vases or suchlike with mock rain falling around them - oil droplets on wires I think. If they were being sold in a small town I guess they must have reasonably common.
Not forgetting Lava lamps!