The staging was confused and busy and it seemed like the director had a bad sense of the style of the show. The point of the Peanuts, at least originally, was that it was kids dealing with life in matter-of-fact and, well, adult ways... but not necessarily being precocious. That was lost here. A lot of the humor simply evaporated and fell flat as the kids were directed to PUSH and PUSH for comedy. Frankly, much of the time it felt like the kids were saying lines because they were told to say them that way.
The show also doesn't really have a plot- it's vignettes, sometimes very brief to the point of being almost like Laugh In (or a comic strip): just a setup and a punchline. As such, there needed to be a brisk pace, and that just wasn't there.
"...everyone finally shut up, and the audience could enjoy the beginning of the Anatevka Pogram in peace."