Best thing to help the stupid people reading is to, every few sentences, just add the name of the other person.

But Donna's tends to speak in longer sentences while Josh doesn't - he really only speaks for a long time when he rants or is depressed. Donna is also very explanatory about everything while Josh is like bang bang bang that's it. Unless of course he's explaining something for the benefit of stupid American viewers Donna. Then he does talk for awhile but it's easy to pick him when he does that.

I really think about these things too much you know.