This is a passage in the movie The Social Network at 01:14:49:
Mark says: "Yeah, that reminds me, we're gonna need more money, Wardo."
Eduardo replies: "Yeah, no, I agree. More servers, more help."
(Emphasis mine.) I want to know why Eduardo says "no" after "yeah". How can he use them both in the same sentence? Is this an idiom?
Note that the quote is based on the subtitles, so I didn't mishear a "yeah, I know" or anything like that.