The information contained in the end credits probably isn't protected by copyright (which protects expressions of ideas, not ideas and facts themselves), instead it protects the particular way that those end credits are expressed. Hence, the background music and the font of the text and any other fideldy bits that go in there to interest the audience are protected by copyright. Something like five or ten people get paid good money to create that little bit of boring video.
Now, would you be sued over that? Maybe not. The various unions reping the people in the credits might get mad if they did. And, their damages case in court would be pretty unimpressive. But, they would technically probably have the legal right to sue for a copyright violation over the clip.