It’s a 210MB Mpeg4 movie file (.m4v). It’s 320 x 240. The video compression listed when played in QuickTime is “AVC0 Media, Millions”. The audio is listed as “AAC (protected), Stereo, 44.100 kHz” and it’s 24fps.
Even though the video is only 320×240, it actually scales pretty well. You can double it without any substantial quality loss. I went all the way up to full-screen (1280×1024), and although it was watch-able at that size, you did lose a lot of detail. I wouldn’t want to watch too many shows stretched that far. That being said, I think it’s still pretty impressive that the file can be stretched to quadruple its original size, and not have it totally breakdown.
The image above is a screenshot from the file when it was stretched to double its original size. Some of the artifacts in the image are from the jpg compression, not from the movie.