But if those factors don't affect the flip, wouldn't that mean your second statement should be ignored because it says to keep the conditions identical and those conditions are the factors that I have talked about right? But I guess you're right, it's not like those factors can quickly change unless there's a physical intervention.
for example, lets say the surface you are doing the flips on has a high temperature. then whatever side the coin lands on will get heated up more than the side that lands face up. you will need to take that into account. maybe wait in between flips until both sides equalize to room temperature.