Chris Rock was the mail room clerk briefly.

And I have a killer Halloween getup including a chromes plastic pistol, a double shoulder gun holster, black pointed sunglasses with the silver brad (key item), white henley, teal/green blazer, white linen pants, and white boat shoes, that has won me a couple Halloween costume prizes.

Did anyone see the 'Friends' episode where they had a throwback scene of Ross & Chandler back in that timeframe? Hilarious.

Q3, Which three show characters are in the black helmets and orange jumpsuits?

Larry had a gambling addiction.

Q4, Which sport centered episode resulting in a killing of an FBI agent's brother, and how did that person die? (Which sport, and how did they die?) What was his name?

Some other tidbits:

The Ferrari Daytona as we know, was a modified Corvette. Ferrari executives were so upset that this ersatz Ferrari was gaining such popularity that they offered to provide the series with their new flagship car, the Testarossa. In scenes where there was the potential for the white Ferrari Testarossa being destroyed the car was "stunt doubled" by a supercharged and heavily modified DeTomaso Pantera. As part of an agreement with Ferrari it was destroyed after the series ended.

Q5, Another well known TV Cop, was a finalist to play Sonny Crockett. Who was this person? What show was he on?

Q6, Which person, who later became a semi-regular on Miami Vice, was killed in the pilot as a different character?

^ Q6 - Iggy.

Correct Rainmn, he was a hitman in the pilot.

Back to the question on who was old enough to watch it when it first ran...I was. Never missed it for the first few seasons. (I'm 34 now, 14 when the show first started.)
By the third or forth season, I had a license and a car, so I pretty much saw all of those in reruns.
If they ever release the show on DVD, I'll be first in line to buy the boxed set.

Actually, it was Stan who had the gambling problem.