I liked almost everything in this movie up until they reach Santa's house. Up to that point it had good pacing for a special. Flying on the wing was great, being thrown out of the mail truck, going through security. It was all great, except one thing. Santa.
The one thing that ruined the movie was what the movie was about. Having Santa as a real character is what makes this special too kiddie. The mobsters saying they don't want to be on the naughty list? Officer Meany letting the muppets go just because he wants back on the nice list? And then that very odd Santa interaction was just NOT right. You take out the parts where Santa is treated like a real person by the adults and you take out the part where the muppets interact with him and you got am uch better special.
I'd much rather have seen Fozzie, Kermit, and Gonzo get to the north pole only to find nothing there. Gonzo leaves the letters and they head back home (how I'm not sure, haven't thought it through just yet. maybe Joy pops up on a snow mobile and takes them back to the air port) then we pan back to the letters and we see a black boot crunch the snow and a gloved hand pick up the letters. Everyone gets back to the house and Gonzo apologies to Claire about not getting the letters to Santa, and then we find out that all Claire wanted was for her friends to be with her on Christmas and that her Christmas wish came true. No need for Santa to be in it at all. The letters were such a let down anyway, the time could have been better spent. And if you really need Santa, have him seen at the end talking to Joy. Far better use of Santa I think.