Saw that one a while back.....the writers/producers constantly bitched about James Best(Roscoe) "ad-libbing" his lines...but was some of the best entertainment in the show(well, that and that orange Charger).
Waylon Jennings, R.I.P.
Writers are often pissy when some "actor" screws with their beautiful prose. Considering the end material, James Best made improvements for sure.