1. She's Josie
2. Archie's TV Laugh Out
4. The High Cost of Living, The Time of Your Life
9. Nutsy Squirrel
12. the demon S'ym being named after him and dressed like Cerebus?
13. Radar

Calling a day on the following:

5. In Obnoxio the Clown #1, what was written instead of the usual (in that era) "Stan Lee Presents"?
8. At a fashion show, whose dress, much to her dismay, turned out to be the Impossible Man?
12. According to Jim Shooter, what was the fee Dave Sim had to pay Marvel to keep using the Wolverine parody Wolveroach?
14. What was the name of 711's prison?
 

8 is incorrect. It was one of her fashion shows but she wasn't the victim.

5 Stan Lee Resents
8 Invisible Woman
12 A dollar

Remaining answer:
14. What was the name of 711's prison?
Westmoor

1.  Which character from comics was on the front cover of the 1982 Comic Book Price Guide?
2. What is the collection name for the Spider-Man event also known as Dead No More?
3. Who did Iron Man kill in the first Armor Wars?
4. Which Conan character has a separate licensing arrangement from other Conan characters?
5. Who published Origins of Marvel Comics and under what imprint?
6. Who published the quasi comic Beautiful Stories for Ugly Children and under what imprint?
7. Who published Radioactive Man?
8, Who is the Green Lantern Corpse?
9. Who was asked to redesign characters they created so that they could get toy royalty money (and by which comic company and for what toy line)?
10. How was a Superman vs Muhammad Ali fight able to occur without Superman having an obvious extreme advantage?
11. Which it's never been made canon, which earlier character was Henry Gyrich intended to be?
12. Which Archie superhero was killed off in the 1980s? They later reappeared in a Mighty Crusaders story without explanation but that story might have just been an inventory story taking place earlier.
13. For which Richie Rich title was his cousin a co-star?
14. Which three characters were on the cover of Comic Cavalcade #1?
15. Overstreet's Comic Book Price Guide used to publish a list of superhero teams for a few volumes? What odd error was in the list?
16. While some fans consider Alan Moore's Superman finale as canon as the final adventure of the Earth-1 Superman (while listed as an Imaginary Story, there's also the "Aren't they all?" bit), which slightly earlier comic contradicts it in at least one way (exact title and issue number)
17. One comic was [name the movie star] Tales of Mystery
18. What team co-starred with Captain Victory?
19. In Destroyer Duck #1, who was a stand-in for Howard the Duck?
20. Which organization assists comic book creators with legal matters?
 

2, 4, 6-7 are correct.
18 is close enough: Galactic Rangers
19 is incorrect. Leonard came later.
20 is almost there but missing a word.

1 is incorrect.
3 is correct, though at the time he was going by Titanium Man
The rest are correct.

17 is incorrect.

17 is correct.

Andy E. Nystrom wrote:

5. Who published Origins of Marvel Comics and under what imprint?

5. Fireside?
 

Remaining answers:

1. Which character from comics was on the front cover of the 1982 Comic Book Price Guide?
Alfred E. Neuman. The qualifier was because someone else (Overstreet?) was also on the cover.

5. Who published Origins of Marvel Comics and under what imprint?
Simon and Schuster was the publisher, for Fireside Book Series

8, Who is the Green Lantern Corpse?
Driq

11. Which it's never been made canon, which earlier character was Henry Gyrich intended to be?
Li'l Petey aka Petey the Pest

12. Which Archie superhero was killed off in the 1980s? They later reappeared in a Mighty Crusaders story without explanation but that story might have just been an inventory story taking place earlier.
Shield (Lancelot Strong)

13. For which Richie Rich title was his cousin a co-star?
Richie Rich and His Mean Cousin Regiie

14. Which three characters were on the cover of Comic Cavalcade #1?
This being a 1940s title, that era's Wonder Woman, Flash, and Green Lantern

15. Overstreet's Comic Book Price Guide used to publish a list of superhero teams for a few volumes? What odd error was in the list?
Brainiac-5 was listed as one of the teams.

16. While some fans consider Alan Moore's Superman finale as canon as the final adventure of the Earth-1 Superman (while listed as an Imaginary Story, there's also the "Aren't they all?" bit), which slightly earlier comic contradicts it in at least one way (exact title and issue number)
DC Comics Presents #97 (different fates for Bizarro and Mxyzptlk)

19. In Destroyer Duck #1, who was a stand-in for Howard the Duck?
Little Guy

Andy E. Nystrom wrote:

4. You are a superhero whose earliest adventures in the 1970s were usually written in the second person.
12. Who was Night Man's original publisher?
15. Who did Frog-Man defeat in his first appearance?
16. Which 1970s team's name alluded to a 1960s war movie?
19. Which mini-series depicted a dystopian future take on Marvels?

4. Iron Man?
12. Malibu?
15. White Rabbit?
16. Combat Kelly and the Deadly Dozen?
19. Ruins

4 and 15 are incorrect. IIRC Frog-Man encountered White Rabbit in his 2nd outing, The rest are correct. Deadly Dozen of course was a nod to the Dirty Dozen, also a team of criminal anti-heroes.

15 is still incorrect. The villain in question is usually non-comedic.

15 is correct. Some legends are born from an epic battle, other legends kind of just happen.