I have grabbed sound clips by basically routing the audio output back to the input and capturing with CDSpindoctor, which is part of Toast. I believe there is a shareware app which can do it easier, but I forget the name, and you have to pay to do it.
Screen captures are a bit stickier. I think you can play the DVD with
VLC, pause, and do a regular screen capture, but you get a somewhat low quality image. This does not work with DVDPlayer. There is another, higher quality method I know of, because I like getting movie stills, but it involves software which can't be discussed on HTF, because it is capable of other bad things in addition to the screen captures.
