Storyline in "The Office" ??

I don t understand when Andy is in the line for the a cappella TV show competition. The host or producer or whoever comes out and says hey everyone etc etc and he says, "And watch out for that pesky mole!" and then someone in his ear says he s not supposed to say that and he says oh forget it.

And then nothing ever happens with that again. Is the annoying blonde girl in line with Andy the mole? And if so, she does absolutely nothing. WTF is going on in this story line?

Thanks.