Joel: You know, guys, lizards were hurt in the making of this film.
The Scrappy: In-Universe example with Joel's puppet, "Joey The Lemur". Crow and Servo quickly get fed up with Joel's over-the-top obnoxious puppeteering. Fortunately, they don't take their frustrations out on the kinkajou which appears in the actual film.
It also became one out of universe, to the point where the show itself spoofed it in Last of the Wild Horses. It doesn't help that Joel blows his lines several times; apparently this was the best take they got and everyone just wanted to move on.
And even worse, Joey has not yet appeared in the film by the time the sketch happens, making it pretty darn confusing on first viewing. They try to cover it with Joel saying he read a film guide that says it'll happen.
And to top it off, there's no lemur in the film anyway. Joey is a kinkajou.