[Mike F]

Trying to do it without googling or IMDB:

Spoiler!

1. Bob Newhart?
2. Kramer
3. Mary Tyler Moore
4. Red Fox (don't know his character)
5. Bull
6. ?
7. ?
8. ?
9. ReRun?
10. Archie Bunker
11. Cosby
12. One of the Honeymooners
13. ?
14. Al Bundy
15. Mindy from Facts of Life
16. Ralf from Honeymooners?
17. ?
18. Grandma from Golden Girls
19. Father Knows Best?
20. Jimmy JJ Walker
21. Norm?
22. ?
23. John Travolta from Welcome Back Cotter?
24. Wilson
25. Urkle
26. ?
27. Mr. Seaver
28. The Fonz
29. Guy from Good Times? (the "Movin' on Up" show)
30. Balky from Perfect Strangers
31. Lorraine
32. Lucy
33. Jacquee
34. Alf
35. Alex P. Keaton?
36. Fresh Prince
37. Grace?
38. Cat from Sabrina
39. Blossom
40. I don't even know what that is. . . .
41. Eddie from Frasier
42. Webster
43. ?
44. Gary Coleman from Different Strokes
45. Punky Brewster
46. Tony Musselli?
47. Mork from Ork
48. Danny DeVito from Taxt
49. Charlie from 2 1/2 Men