These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Broken Base: Either this is one of the better of the made-for-TV Muppet movies to come about in the 2000s, or this is a blemish on the Muppets' integrity. The majority of Muppet Freaks really love this movie, feeling it did a better job capturing the original dynamics of the characters and their interplay, as well as maintaining the same sense of mayhem and chaos the Muppets' humor is known for; however, a small minority of fans feel this movie has none of that, that the movie is dark, trite, tries too hard to make the Muppets seems relevant and edgy, and pushes the envelope way too far in how much adult humor the Muppets partake it.
The Muppets' Christmas show is an elaborate spoof of Moulin Rouge!, possibly the best Muppet parody in a decade. To wit, the scene makes fun of Baz Luhrmann's editing style (at one point Fozzie grabs Kermit by the neck with his cane and begins twirling him in circles just to make the camera spin dizzyingly around them), has chickens singing Lady Marmalade, Gonzo very appropriately dressed as Toulouse-Lautrec, and Miss Piggy as "Saltine", choking on the dramatic fog in her entrance and coughing uncontrollably (making a big laugh out of what was the most tragic scene in the whole movie). In the end, Miss Piggy brings the whole thing to a halt to scream at everybody to stop singing different songs at the same time.
In Moulin Scrooge, the Satine parody is named "Saltine". When Cinema Sins did "Everything Wrong With Moulin Rouge", one of the sins given out was "the most beautiful courtesan in the world is one letter away from being named after a cracker."
Nausea Fuel/Nightmare Fuel: In the alternate reality, Rizzo has one of the worst fates; he's in Fear Factor as one of the challenges, where he's locked in a cage and the contestants have to eat him alive. And he didn't even know about it.
Squick: Pepe's methods of sucking up to Bitterman are a little disturbing, to say the least.
Cage dancing Scooter in the Kermit-less world also qualifies. In skin-tight leather, no less.
Tearjerker: The Muppets' lives in the Kermit-less world are almost entirely bad, but most are not wholly depressing. Gonzo and later Piggy, however, aren't so fortunate. The former is a homeless performer eeking out a pathetic living, and the latter is bitter and depressingly lonely.
True Art Is Incomprehensible: The original opening number for the Christmas show (directed by a French choreographer that Gonzo hired) was... decidedly un-Muppet-like. Case A: it had a Muppet throwing glass Christmas ornaments directly at the audience.