depends on what you want. Do you want to see a big jump when the second calibration is also ‘out-of-range’, or is that jump ignored as well, or do you want to see the system slowly move to calibrated values. Big jumps are fine for the initial calibration where the system corrects possible bad factory calibration, or adapts to the setup environment. Other then that, calibration should perhaps only correct for drift in sensors, which hopefully is pretty small, so once it is calibrated, no big jumps should be allowed. ((but to allow for changing setups, the steps could be as large as say max 5% (way more then the sensor drift) so it can change a lot, given time))
Flagging for further inspection as you suggest, might get complicated. Who does the further inspection? the user? he or she doesn’t get to see all that is going on with calibration. Weatherflow staff? they might be unaware that you moved the unit to a different location.
But I would like to see in the graphs when a calibration is applied to the data (a little exclamation mark on the horizontal axis perhaps)