I watched this and I laughed. I watched it a second time laughed even harder. I watched it a third, fourth, fifth, etc time, and now I feel warm and fuzzy whenever watching it again.
I must say, though, if you're going to make more Peck cartoons, you HAVE to keep the coach, or at least some kind of foil for Peck. Peck himself was only really funny because of how he abused that poor coach's patience. Peck getting beaned in the outfield (twice) is funny, but the coach's desperate pleas for him to just do something is what really made it funny. "PECK, YOU GOTTA RUN!!" Hilarious. And that voice work! Darn. I crack up every time the coach barks Peck's name.
The scenario shifts (or whatever you want to call them, you know what I mean) were great too. I think you guys are getting the hang of pulling those off consistently. It's kind of like in your Obama cartoon when Obama takes a sudden interest in the other guy's plans, except in this cartoon the shifts just keep coming. It almost feels ad-libbed and it makes no sense, but it somehow feels so very right. I don't know if you're trying to work out a "style" for your cartoons, but I don't think anyone would mind if you made a habit using that gag.
I didn't get the commentary video (yet??) so it's entirely possible I'm saying things you're already aware of, but I think there's value in reviewers giving their first impressions. Plus, I wanted to give you a hand for making a darn funny cartoon.