Misc: In 1975 Netherlands grants ---------- independence (Natl Day). ?

Questions

Who was the head villian on "The Smurfs" and what was his cat's name?

What was the name of the guy who couldn't enunciate on "The Fat Albert Show"?

What was the name of the hollow hole-covered plastic ball kids used to hit instead of a baseball?

What German siren sang "99 Luftballons" (known in the US as "99 Red Balloons")?

What group sang "Come On Eileen"?