BEAR said:
Richard Hunt performed Forgetful Jones, Gladys the Cow, a Grouch, Sully and others.
Kathryn Mullen played the Feathered Friend's Magistrate and a Grouch.
Jerry Nelson performed Biff, the Count, Herry Monster and Sherlock Hemlock in the movie.
It looks like you read this information at the Internet Movie Database, which is sometimes wrong. Who was the feathered friends magistrate? Kathy Mullen didn't get credited as one of the Board Of Birds, and I think the number of performers credited with the board of birds was the same as the number of birds seen (with te obvious exception of the performer who performed Miss Finch).
The Count should have been credited at least. He was definately important enough to be listed in the credits.
Herry Monster also had a different voice when he said his one line in the movie. It is obvious that Jerry Nelson didn't perform him in that one scene. None of Jerry Nelsons other characters spoke in that scene, so it would have been ridiculous for somebody else to have performed Herry just so Jerry nelson could perform somebody who didn't talk. That scene was the only scene where Sherlock hemlock appeared, and he didn't speak. Forgetful Jones also didn't speak and didn't do anything major in the movie. There weren't even any close-up shots of him. Richard Hunt could have performed him in those scenes. Or somebody else could have.
Bear said:
So they were playing their regular characters in the movie some even had lines, but I guess they just didn't have as prominant a role to be credited the same way Spinney, Oz and Henson were, and not quite small enough to be with the "additional performers". I think they should have atleast been creditted the way Martin Robinson and Tom Gosley were with the smaller cast list along with the characters they played. Though maybe it wasn't considered very high billing.
I think jerry nelson might have been available to perform in the movie more than Jim Henson did. I think Jim Henson and Frank Oz only had such prominate crediting (secodn and third billing) because thye are better known to the general public than the other performers. If you think about it, kermit only appeared in one scene, and Ernie didn't really have too many lines, with his only real major scene being in the Upside-Down World number. I wonder if Jim henson dubbed Ernies lines in any of his smaller scenes (such as when Ernie and Bert head off to get the plane or when they are at the gas station).
Bear said:
The same can be seen in Steve Whitmire billing in the first 3 Muppet films. Steve Whitmire is never listed with the other performers, but separately with the list of additionals. The only difference is he still got to be credited with "as Rizzo the Rat" next to his name.
I thought he was listed with the other main performers in The Muppets take Manhattan. Also, remember that in GMC his credit had "As Rizzo The Rat and Lips" next to his name, while in MTM his credit had "as Rizzo The Rat and Gill (frog)" next to his name.