Saw a full guide for one season 12 episode that has Poco Loco listening to Snuffy on the phone and imitating his voice. I think that's one that was described in the season 12 program guides, but it is clever to have a character from one performer imitate the voice of another character of the same performer (okay, maybe not that clever, as it seems like an obvious trick).
For a while I had thought about how Countess von Dahling's counting makes it rain, how that could be beneficial to society (and added such info at TV Tropes, can't remember if I put it in "Reed Richards is Useless" or "Cut Lex Luthor a Check"), especially since after season 12 (when the character was probably dropped, but I guess we'll see soon if she ever did reappear after season 12) there were at least two episodes involving water shortages (and in one of them they tried making it rain by having everyone count with The Count, thinking the thunder and lightning would help). But then I saw one season 12 guide about a hot day, and now I remember that the season finale was about a heat wave. And in neither case did they enlist the Countess for help. And then I saw a guide where they DO ask her to count to make it rain, though in this case it's to water plants as opposed to being too hot or a water shortage or something (and then it still failed as she thought Masha was having a cold and just stopped).
I've seen a few pages on the wiki that mention scripts indicating things that were cut. Stuff like a lost "Maria as Charlie Chaplin" sketch (which seems to say it was meant for but dropped from two different episodes) and a Grouch parody of some 1990s song/group (I already forget who, I want to say MC Hammer). I'm surprised that the finale aired versions of scripts actually mention segments being cut from the final aired versions (but I guess it's not the first thing I was surprised to learn regarding the scripts).