I had to mask all the windows and rubber seals on the inside, plus the column and pedals and such, you can see most of what was taped off to try and stop overspray and what not. Let me tell you this though.... I wore a respirator/paint mask had the door open, was outside in the yard, fan on sucking fumes out, and I still got high as a kite doing this so be warned.
I have seen guys mask the dash and only paint the metal that can be seen though.