It's all Noodles to Me

On Sunday, I passed the following billboard at Westbahnhof subway station: 

Huh? "Wird hier Nudeln gekocht"? That was the wrong - singular - form for "noodles will be cooked/prepared". I was in good company, though, as upon closer inspection of the advertisement it turned out someone else was a stickler for correct grammar:

I like the "Danke!" after the underlined correction.