To bad they don't have better researchers for the episodes.
For example, there was no Col Tomb in the NVAF.
I think that is a relatively minor error as such things go. By and large, I find the series to be far more accurate than about anything similar you see on the history channel or discovery. Very little of the common false mythology along the lines of hub mounted mk103s on Me109s, etc. Tactics, maneuvers and general performance parameters are largely accurate as far as I've seen.
Now, not as accurate as some of the history minutia crowd might appreciate (which I can fall into in some areas myself) but more than "good enough for government work" and accessible to a general audience. In fact, perhaps pushing the boundaries of a general audience.
Charon