Question about The 12 Days of Christmas from A Christmas Together TV Special

When they sang 12 Days of Christmas, was it scripted when Fozzie kept missing his line or was that improvised? My brother and I were watching it on youtube and it just made us crack up. It looked like it might have been a mistake that they just went with, seeing as how it's such a long song to keep doing a retake on. Anybody happen to know for sure? What do you think?

I have a script somewhere in storage (before everything got so messed up for me financially, i used to collect scripts) and even though i have to dig it up to be sure, if i remember it correctly, it was scripted.

With a long repetitive song like "12 Days" (esp when it's the opening song), you need ways to keep it interesting - Fozzie's forgetting the lyrics would be something planned ahead of time to remedy this problem.

Also, when the Muppets sing, the audio is pre-recorded, so the only way it would be possible for a Muppet to make a mistake while singing is in the audio room.