I've gone through the DVD and found the original shot for those interested. The screenshot is untouched, I just converted it to jpeg (that's why it looks a little "squashed").
Pulsar:
Haven't had any problems with making screencaps. It's a standard DVD, it can't be something else then mpeg-2 as far as I know(?). I used Xine (on Linux), no idea if it causes problems on Windows-based software DVD players.