The only obvious mistake I remember is that one (around 0:28 ):

There was some sloppiness to his playing during one of the KTF rehearsals where he didn't keep the rhythm properly. And I remember someone telling me from a SBD version of Tokyo road from the NJ era that he had basically played one note throughout the whole chorus. Other than that I can't recall any major mistakes. But he certainly didn't look too healthy during his last TV appearances with the band.

He was on radio in 2008: