It's like this:
On their fake anniversary show, they had a bunch of fake callbacks to things they fictionally did during their run - this was in season 1, and was supposed to be them looking back on their show and career. One joke that the fake audience seemed to love was a character called Grumm, a creepy, poorly animated CGI thing that came out and sang a bad song about crackers and snacks. The whole audience got up and started singing along, but obviously there's not really a CGI person on stage in front of them. When asked about it in an interview, they said that it had to do with the fact that it really was awful, but that type of thing really happens. There are terrible productions that really would have made something like Grumm a reality, and there really are shows where they pretend that CGI characters are in front of real audiences singing along, and there really are songs as bad as "Crackers and Snacks" that studios get behind and try to get audiences enthusiastic about. Grumm's not real, but he could be.
Some people will see Grumm and like the comment, think that the fact that that type of thing could really exist in our world is funny and laugh at how terrible it is, as well as the comment it's making. Others will just look at it and not enjoy it.
Of course, there's all the weird editing and such, but a lot of their humor has to do with this. Hence rips on public access, weird celebrity stuff, etc.
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