Michael K (8.06):

W.G. "Snuffy" Walden, the guy who wrote the theme tune for The West Wing. Killer programme.

Adrian Paul (3.06):

Years and years ago (25 plus), in the days when I watched far too much
television for my own good, my brother & I noticed how frequently in the
credits we saw the item "Rostrum Camera - Ken Morse". Recently, I saw
this name again. Can it really be the same person, still working?! Or
is "Ken Morse" some kind of nickname for the guy who works the rostrum
camera?

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In fact, he does exist. Wikipedia tells us of national treasure Ken.

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Henry S writes (4.04):

Does Screaming Mad George the special effects make-up artist count?

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At last! From Jonathan R (5.4.02):

The crew name that always gets me is Bob "Gandhi Bob" Arrollo, who seems to be part of the
furniture at ER.

http://uk.imdb.com/name/nm0037377/

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I'm going to have to put in some work on this myself.