If it originally aired that way, then I almost wonder if they used Part 1 end credits over Part 2, because I remember seeing the name of Marion Ross who only appears in Part 1 in the Part 2 end credits, but Fred Sadoff who appeared only in Part 2 as the police psychiatrist was not in the end...
I just watched the S5 debut too, and yes, not only is it not remastered, it's been presented in a syndicated version where it's split up in two parts (albeit with no episode content edited) because the end credits reveal clearly that this first aired as a single two hour movie special (based on...