1. In Detective #336, Batman was bewitched. Who was the witch, and who was the real mastermind behind her?
As I discussed previously, Zatanna was the witch, and the man behind the scenes was the Outsider.
2. Although vampires were prohibited, the CCA allowed two stories featuring a villain who stole the life force from people, battling (and battering) Superman. What was the name of this villain?
3. Who was the original Green Goblin?
Peter Parker discovered in ASM #40 that the Green Goblin was actually Norman Osborn, the father of his (later) college roommate.
4. What was the name of Marvel/Atlas' late 1950s ripoff of Casper, the Friendly Ghost?
Marvel tried amusing the kids with Homer, the Happy Ghost.
5. Although werewolves were banned as noted above, one key DC character turned into a wolf in a mid-1960s comic. Name him.
Superboy turned into a wolf in Superboy #116:
Well, a Wolf-Boy, anyway. As usual with these really amazing situations, it's all a plot to fool some aliens:
Michael Rebain got all but #4 although he was thinking of a later Superboy story than #116. Dan M scored 100%, and gets extra credit for pointing out that Jimmy Olsen turned into a Wolfman in April 1961. On #2, George C notes Starbreaker, a villain who appeared in JLA #92, but the story was published in 1972, when the CCA had very much relaxed its standards regarding horror themes--for example, Spiderman battled a vampire-like creature named Morbius in ASM #101-102, which came out in October/November 1971. Mike P came up with all but #4.