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So far, I have identified (top-to-bottom, left-to-right):

1. King Kong
2. Blaine Colt aka Kid Colt
3. (generic knight -- no ID)
4. (generic outline -- no ID)
5. Baron von Strucker
6. (generic outline -- no ID)
7. Jackie Gleason
8. Dr. Doom
9. Possibly J. Jonah Jameson assuming the arm is not his.
10. Charles de Gaulle
11. Grandpa Munster, from the Munsters
12. Herman Munster, from the Munsters
13. Peter Sellers
14. Elizabeth Taylor
15. Richard Burton
16. Alfred E. Neuman, mascot for from Mad Magazine
17. Looks a tiny bit like Bob Dylan, but not really
18. Muhammed Ali
19. Mitch Miller
20. Frank Sinatra
21. Mia Farrow
22. Bobby Kennedy
23. Dr. Martin Luther King, Jr.
24. Mao Tse Tung
25. Lyndon B. Johnson
26. Possibly Aunt May
27. (generic orc)
28. Davy Jones, of The Monkees
29. Mickey Dolenz, of The Monkees
30. Michael Nesmith, of The Monkees
31. Peter Tork, of The Monkees
32. Don Knotts
33. Thor

So far, I have identified (top-to-bottom, left-to-right):

1. King Konk, parody of King Kong
2. Kid Cold, parody of Kid Colt
3. (generic knight -- no ID)
4. (generic outline -- no ID)
5. Baron von Strucker
6. (generic outline -- no ID)
7. Jackie Gleason
8. Dr. Bloom, parody of Dr. Doom
9. J. Jawbone Junkton, parody of J. Jonah Jameson, with a Conan-style arm rising beside him.
10. Charles de Gaulle
11. Grandpa Munster, from the Munsters
12. Herman Munster, from the Munsters
13. Peter Sellers
14. Elizabeth Taylor
15. Richard Burton
16. Alfred E. Neuman, mascot for from Mad Magazine
17. Bob Dylan, drawn badly enough to also look like Art Garfunkel
18. Muhammed Ali
19. Mitch Miller
20. Frank Sinatra
21. Mia Farrow
22. Bobby Kennedy
23. Martin Luther King Jr.
24. Mao Zedong
25. Lyndon B. Johnson
26. Auntie Mayhem, parody of Spiderman's Aunt May
27. (generic orc)
28. Davy Jones, of The Monkees
29. Mickey Dolenz, of The Monkees
30. Michael Nesmith, of The Monkees
31. Peter Tork, of The Monkees
32. Don Knotts
33. The Mighty Sore, parody of Marvel's Thor

edit: Incorporated the Not Brand Echh identities from the answers below.

So far, I have identified (top-to-bottom, left-to-right):

1. King Kong
2. Generic Cowboy, possibly based on Roy Rogers
3. (generic knight -- no ID)
4. (generic outline -- no ID)
5. Baron von Strucker
6. (generic outline -- no ID)
7. Jackie Gleason
8. Dr. Doom
9. Possibly J. Jonah Jameson assuming the arm is not his.
10. Charles de Gaulle
11. Grandpa Munster, from the Munsters
12. Herman Munster, from the Munsters
13. Peter Sellers
14. Elizabeth Taylor
15. Richard Burton
16. Alfred E. Neuman, mascot for from Mad Magazine
17. Looks a tiny bit like Bob Dylan, but not really
18. Muhammed Ali
19. Mitch Miller
20. Frank Sinatra
21. Mia Farrow
22. Bobby Kennedy
23. Dr. Martin Luther King, Jr.
24. Mao Tse Tung
25. Lyndon B. Johnson
26. Possibly Aunt May
27. (generic orc)
28. Davy Jones, of The Monkees
29. Mickey Dolenz, of The Monkees
30. Michael Nesmith, of The Monkees
31. Peter Tork, of The Monkees
32. Don Knotts
33. Thor

So far, I have identified (top-to-bottom, left-to-right):

1. King Kong
2. Blaine Colt aka Kid Colt
3. (generic knight -- no ID)
4. (generic outline -- no ID)
5. Baron von Strucker
6. (generic outline -- no ID)
7. Jackie Gleason
8. Dr. Doom
9. Possibly J. Jonah Jameson assuming the arm is not his.
10. Charles de Gaulle
11. Grandpa Munster, from the Munsters
12. Herman Munster, from the Munsters
13. Peter Sellers
14. Elizabeth Taylor
15. Richard Burton
16. Alfred E. Neuman, mascot for from Mad Magazine
17. Looks a tiny bit like Bob Dylan, but not really
18. Muhammed Ali
19. Mitch Miller
20. Frank Sinatra
21. Mia Farrow
22. Bobby Kennedy
23. Dr. Martin Luther King, Jr.
24. Mao Tse Tung
25. Lyndon B. Johnson
26. Possibly Aunt May
27. (generic orc)
28. Davy Jones, of The Monkees
29. Mickey Dolenz, of The Monkees
30. Michael Nesmith, of The Monkees
31. Peter Tork, of The Monkees
32. Don Knotts
33. Thor

So far, I have identified (top-to-bottom, left-to-right):

1. King Kong
2. Generic Cowboy, possibly based on Roy Rogers
3. (generic knight -- no ID)
4. (generic outline -- no ID)
5. Baron von Strucker
6. (generic outline -- no ID)
7. Jackie Gleason
8. Dr. Doom
9. Possibly J. Jonah Jameson assuming the arm is not his.
10. Charles de Gaulle
11. Grandpa Munster, from the Munsters
12. Herman Munster, from the Munsters
13. Peter Sellers
14. Elizabeth Taylor
15. Richard Burton
16. Alfred E. Neuman, mascot for from Mad Magazine
17. Either Colin Baker, from Doctor Who; or Bob Dylan
18. Muhammed Ali
19. Mitch Miller
20. Frank Sinatra
21. Mia Farrow
22. Bobby Kennedy
23. Dr. Martin Luther King, Jr.
24. Mao Tse Tung
25. Lyndon B. Johnson
26. Possibly Aunt May
27. (generic orc)
28. Davy Jones, of The Monkees
29. Mickey Dolenz, of The Monkees
30. Michael Nesmith, of The Monkees
31. Peter Tork, of The Monkees
32. Don Knotts
33. Thor

So far, I have identified (top-to-bottom, left-to-right):

1. King Kong
2. Generic Cowboy, possibly based on Roy Rogers
3. (generic knight -- no ID)
4. (generic outline -- no ID)
5. Baron von Strucker
6. (generic outline -- no ID)
7. Jackie Gleason
8. Dr. Doom
9. Possibly J. Jonah Jameson assuming the arm is not his.
10. Charles de Gaulle
11. Grandpa Munster, from the Munsters
12. Herman Munster, from the Munsters
13. Peter Sellers
14. Elizabeth Taylor
15. Richard Burton
16. Alfred E. Neuman, mascot for from Mad Magazine
17. Looks a tiny bit like Bob Dylan, but not really
18. Muhammed Ali
19. Mitch Miller
20. Frank Sinatra
21. Mia Farrow
22. Bobby Kennedy
23. Dr. Martin Luther King, Jr.
24. Mao Tse Tung
25. Lyndon B. Johnson
26. Possibly Aunt May
27. (generic orc)
28. Davy Jones, of The Monkees
29. Mickey Dolenz, of The Monkees
30. Michael Nesmith, of The Monkees
31. Peter Tork, of The Monkees
32. Don Knotts
33. Thor