I considered it a reference as well, considering the first 2 live action movies had Henson participation.
I meant a reference to an earlier joke, where somebody asked about something they were wrong about and someone else just confirmed they were right.
Was Judd Hirch's cameo cut? I thought I read he was left in, but I don't remember seeing him in the movie.
The montage with characters being grabbed by hooks was both funny and odd. I can see why they'd do that to Sam (it'd probably be hard for them to get him to want to be involved. Then again, the Muppets might be considered good taste to Sam compared to what's out on TV and film these days), but I doubt it would have been that hard to get Scooter and the Electric Mayhem to want to be involved again. And they didn't do that gag for everyone, though I guess that's funnier than several short cut-aways with everyone accepting the offer right away like Rowlf did. But it makes me wodner why they didn't just do that to get Miss Piggy to come back (aside from creating plot conflict).
I wonder how the scene with the car coming out of the ocean was done. I doubt they'd put actual people in a car underwater. I wonder if the car was remote-controlled.
I also noticed that in the "we need you!" scene, Walter was present in the trailer, but I didn't see him there at all in the movie (and continuity-wise I think he was at the theater when that scene happened).