Hi all (especially to anyone who can look at / fix this),
I was just checking the specs on the Arduino Pro Mini board (here) to make sure I understood the IO capabilities, and noticed that it said
"6 analog inputs" within the "Overview" section text, "Analog Input Pins 6" within the "Summary" table, but then 8 analog inputs later on in the text.
I believe the number 8 to be more accurate, as there are four along the edge (A0 to A3) and then four inboard of the edge "holes" (A4 to A7), as also shown in the schematic (here).
By the way, after looking about a bit more, I notice that the original versions of the Arduino Pro Mini (here (5V/16MHz) and here (3.3V/8MHz)) only had the four edge pins A0 to A3 and two inboard pins A4 and A5, and the current version also has another two, A6 and A7 on inboard pins.
So that might be the source of the confusion.
I also note (only from others' online comments, though; I've not managed to find an official source to back this up) that while the six pins A0 to A5 can be repurposed to be digital IOs, pins A6 and A7 can only be used as analog inputs. So those last two are somewhat different to the first six anyway (in their additional functionality).