[aerohead]

1) even though qualifiers are mentioned, I believe that the viewer would have been better served had you navigated at least one fastback which does not produce the type of lift illustrated. My experience was of overgeneralization.
2) ditto for 'wake size' attributed to drag, as examples of larger wakes with lower drag exist in the public domain.
3) and as to the tuft testing, and in light of the Porsche 911, VW New Beetle, and 2010 Audi A7 Sportback, there's a clear solution liability, by virtue of misinterpretation of observational tuft alignments, should the individual confuse 'downwash' phenomena with 'attached flow.'