Fred Avery: His first animation (and directing) experience was on Lantz's Oswald shorts.
Norm Blackburn: Another early Oswald animator. Later worked for Harman-Ising at Warners.
Les Clark: The most experienced of Disney's Nine Old Men, His first animation stint was on the Disney Oswalds, and would later leave along with Disney when he left Winkler and formed his own studio.
Ben Clopton: Animator on the Disney and Mintz Oswalds.
Friz Freleng: Got his start as an animator on the Disney Oswalds, and his first directing experience was on a Charles Mintz Oswald, "Fiery Fireman". A notable piece of his early animation is a scene from "Oh, Teacher!" where Oswald rides on the words "HELP!" sent to him as a horse to save his girl.
Rollin "Ham" Hamilton: An esoteric but important animator in the Ub Iwerks, Disney and Harman-Ising studios later on, Ham did much work on the Disney Oswalds. One scene that has been identified as his work is the scenes from "The Ocean Hop" where the wiener dog is running to help Oswald.
Hugh Harman: Prolific animator on the Disney Oswalds, and even did work on the Mintz Oswalds before getting fired.
Ub Iwerks: The top animator on Disney's Oswald, drawing out the key poses and handling the overall animation direction.
Walter Lantz: Besides directing, Lantz himself would often do animation on his early Oswald shorts.
Bert Fiske: The first composer on the series, who started working on the shorts during the Mintz era, and was "inherited" by Lantz when he took over. His music had a very slow, ponderous style. Composed for 23 shorts in all.
James Dietrich: The series' most prolific composer by some distance, who worked for the Lantz studio from 1930 to 1937. He drew heavily from contemporary music styles, predating Carl Stalling's similar approach at Warner Bros. by five years.
Irving Actman: Credited on just one short, 1937's "Duck Hunt", though in actuality the short just used stock music he had composed elsewhere, since James Dietrich was unavailable for some reason.
George Lessner: Worked on at least 4 shorts in 1937, and possibly a fifth, "Football Fever," the credits for which are missing.
Nathaniel Shilkre: Composed for 7 cartoons in 1937-38; possibly 8, since he would likely have composed for "Football Fever" if Lessner didn't.
Frank Marsales: Better known for being the first-ever cartoon composer at Warner Bros., and also providing the music for Woody Woodpecker's first short, but he also worked on a single Oswald carton, 1938's "Man Hunt."
Frank Churchill: Again, better known for his work elsewhere (at Disney, in particular), but he did the music for the last regular Oswald short, "Feed the Kitty" in 1938.
Darrell Calker: Way better known for his work on Woody Woodpecker, but also composed the music for Oswald's final short, 1943's "The Egg Cracker Suite."
Hey, It's That Voice!: The first few cartoons to have actual dialogue for Oswald had his voice provided by none other than Pinto Colvig, who was working as an animator for Lantz at the time, and would subsequently go on to become the voice of Goofy.
Hostage For Macguffin: In Real Life. Oswald, even after 80 years, was still owned by NBC/Universal, not Disney. To get him back into their intellectual property, Disney gave Universal one of their sportscasters, Al Michaels. To understand how crazy this was: Disney traded the contract of a LIVING PERSON for the rights to an old cartoon character.
Lost Him in a Card Game: In a meta-example, this was how Lantz gained the rights to Oswald from Universal founder Carl Laemmle.
Marth Debuted in Smash Bros.: You can bet your left foot that most people who are aware of Oswald's existence owe it to the series Epic Mickey (which was intentionally made as a comeback vehicle for both him and his brother, and the games at least acknowledge Oswald's original cartoons). Adding to the issue is that while half of his cartoons are available on DVD, said set only got a limited release, and wasn't released in other countries.
11 of the 26 Disney-made Oswald cartoons are possibly lost forever, and even some footage of the Oswald cartoons that were found for the DVD collection had to be taken from reissued versions which arranged and/or chopped out footage from the original negatives (i.e. A bit of footage near the end of Ocean Hopwhere the dog Oswald was flying on to win the race falls into the pen hood of a car while flying over France, gets cranked through the engine and comes out of the exhaust pipe transformed into a string of wienies).
Several of the '30s Lantz Oswald shorts have been lost, too many to list as is. Some of the Charles Mintz shorts still exist, but likewise several of them have been lost as well.
The Other Marty: Oswald's voice actor would occasionally change in the middle of the cartoons. In "Confidence" for example, Oswald starts off with a fairly deep male voice, then suddenly changes to a high-pitched female voice halfway through, and then reverts back to the male voice near the end of the cartoon.
Take That: Some believed that name of the villain of Pixar's Up, Charles Muntz, was a jab at Charles Mintz. However, this was Jossed by Pixar staff, who claimed that it was just a coincidence.
What Could Have Been: Can you imagine how things would be if Mintz had given Disney the budget bump he asked for instead of trying to screw him over?
Walt would never have started his own company and eighty years of animation history would have been entirely different?