How could a billion possibly be something other than a billion?
It is, of course, a billion, but is it 10 to 9 or 10 to 12? The former is milliard here (I think we have been following German practice there for quite some time).
1 pint = 1 pound (assuming volume density 1:1 relative to water, same as 1mL = 1cm3.
1 gallon = 231 in3 (exactly 231...no rounding or whatever)
US liquid pint is 473 milliliters, but a pound is 454 grams, so a US liquid pint of water weighs 473 grams. Much like a fluid ounce of water weighs more than an ounce. Avoiding conversion factors like 231 cubic inches to a gallon is the essence of the metric system. Of course the basic units don't need to match with models in Paris for it work well in physics classes - they could be something else.
Having said that I do like beer in UK pints (568 milliliters).
More about comma vs point. We use point here to indicate ordinals, so "1." is "the first" and so on. This is used e.g. in dates, so "18.02." is "February 18th". Programs like MSExcel tries to cope (the different kind of separators and such are regionally configurable in Excel), so when I copy numerical tables produced in the US to a Finnish edition of Excel, it interprets figures containing a decimal point as dates, and performs an irreversible conversion (at least I haven't figured out how to revert it). Arrggh.