Mark was talking about how he always envisioned a way to connect people. And he was citing examples of early hacks he made in college. Of course, his most notorious one was the "FaceMash" hack, the one the movie, "The Social Network," put a lot of emphasis on. Hence, Mark was venting a little frustration that his other notable achievements went largely unnoticed by the public.
He was frustrated at its portrayal that Facebook was a direct result of Facemash.
pg asked about FaceMash, and he said something like "It was nothing. Everyone thinks it was a huge deal. That stupid movie..."