Do I even need to?
The Any Old Iron number. Song's not that funny, the Muppets don't do anything particularly funny either. You know where I'm going with this, so if you haven't heard me say it a hundred times, move on.
The Muppet with the missing pupil! The puppeteer tries so hard to push him as far into the background as possible to make it look inconspicuous, but in doing so, makes the character impossible to miss! So you have the entire music number where an otherwise unnoticeable background error winds up dancing around onscreen for a whole 2 minutes, and you just cannot take your eyes off of it. There have been little mistakes here and there on varying levels of obviousness, but this one may as well have the character screaming "I HAVE NO EYE! I HAVE NO EYE!" for the whole number.