Hey, I have been criticizing NBC a lot for their lack of captions. (Not Bothering with Captions)
Episodes of 30 Rock are provided with Captions on their full episode player. Be sure to select “Full Season”
Not Chuck or SNL (my favorite NBC shows), and so far no others that I can find.
I have sent my request for more captions and captioned video search/labeling to their technical support.
You should too.