They used up about 3 minutes of story with that 'previously one'. I don't mind that, they had to do that back then, no PVRs and you had to be somewhat wealthy to have a VCR still.
Oh we have an update on what kind of board that was.
Eddie's got it bad.
"It" being being in love with Mrs. Kotter.
This is maybe the most 1970s episode, and I keep saying that. Hell, this one even has a Shah of Iran reference.
The ol' mud on the shoes clue. I wonder, how often that is useful in real-life investigations?
This is a much less complicated plot than it seems and somehow also more complicated than it seems.
As an aside, the music charts are really changing.
I'd find dried sauce on someones mouth an extra bonus, but that's me.