I was wrong.
After watching the above video you will understand.
Thank you, Master Yankovic, for being so awesome. You are a genius.
The truth of it is, I misheard him. Let me explain.
As you listen, pay attention to the counter at the bottom of the video. When you get to 1:38, take note of the words. What does Weird Al say?
To me, it sounded like he said (despite what was written on the screen), "Okay now here's some notes." Is that what you heard?
This is one of the most common grammatical errors committed in the English language. It occurs regularly in common dialogue: the use of the singular form of the verb "to be" with a plural noun. This is a breach of the rule called "subject--verb agreement."
As the rule states, the singular verb "is" cannot go with a plural noun. You would not say "There is some books on the shelf," that would just be crazy (not the mention wrong, wrong, wrong---don't ever say that). A plural noun needs a plural verb, and a singular noun needs a singular verb:
"There ARE some BOOKS on the shelf."
"There IS a BOOK on the shelf."
So, because Weird Al said "some NOTES" we need the plural version of the verb "to be." We need ARE. And that is exactly what he said. "Okay now here're some notes."
My wrists are free for slapping.
Forgive me, Master Yankovic. You are the king. I was wrong.