Since I posted it on Facebook and Dave Mackey mentioned it...
I also have a 16mm print of "Gaston is Here" (1957). However, the print is very splicy and a good bulk of the credits was hacked away by whoever owned it previously.
That said, what was left was interesting. After Bill Weiss's credit appeared, signatures of every other Terrytoons staff members appeared. Before Gene Deitch came only three people received screen credit in this order: Story (John Foster before 1950, Tom Morrison after that), Director, and Music (always Phil Scheib). But here, EVERYONE's name appeared, even if it was for only a few seconds and in really tiny letters.
Here are some of the signatures I was able to read. I identified their staff position if known (thanks to Deitch's autobiography), but others I'm unclear. And yes, the odds are alot of the spellings are incorrect.
With that said...
Ralph Bakshi (at the time cel painter)
Vinny Bell (animator)
Bill Benulis (later comic book cartoonist)
Doug Moye (cameraman and occasional voice actor)
Arnie Levey (assistant animator)
Joan M. Gaiagher
Sal Greco (film editor)
Dave Ubinas (later designer for Paramount)
Cosmo Anzilotti (ink & paint, later animator)
Jack MacConnell (film editor)
George Davis (camera)
Ralph Rossburg (cel painter)
Bill Focht (BG artist)
Eli Wolfson (film editor)
Ava M. Tasadfoey (checker)
Robert Corelli (film editor)
Walt Gleason (prod. supervisor)
Mary Taracka (assistant animator)
Peggy Breese (animator)
Conrad J. Rasinski (aka Connie Rasinski, the short's director)
Connie Higgins (ink and paint)
Andrea Ambrose (ink and paint)
Terry Guadagno (ink and paint)
Douglas "Doug" Crane (cel painter)