The voice of the umpire was that of Arnold Stang, who also voiced Herman the Mouse and, later, Top Cat. He also did guest spots on many TV shows, including "Bonanza" and "Batman" (3rd season).
This is an unusual cartoon in that most Famous Studios / Paramount cartoons of the time had the title of the cartoon appearing AFTER the animation credits.
At the time, Paramount's New York "Famous Studios" unit could still create great cartoons, but within a few years, they were producing "formula" cartoons {Popeye, Casper, Herman & Katnip", the "Noveltoons" featuring Baby Huey, Little Audrey, Buzzy, and several "one-shot" characters} that looked cheap...and they were starting to "borrow" ideas, even from previous cartoons; the gag at 3:17 was "swiped" from Tex Avery's "Batty Baseball" (1944), as was the closing gag from "Baseball Bugs" (1946).
@RJRanke That's true, about the only halfway original things about each Pepe LePew toon was how the cat (or once, a chihuahua!) managed to get a stripe down its back.
Additionally, I never knew that "Take Me Out to the Ball Game" had more lyrics. And did Warner Bros. copy that last joke in "Baseball Bugs" or was it the other way around?
Borrowing your own gags was nothing new- Tex Avery did that CONSTANTLY, and you could argue that that's all Chuck Jones did with Roadrunner and Speedy Gonzales.