Good point. Their tool is obviously useful, even though something like this might not be the best use case for it.

The HUD thing - it looks like they screwed up the post-processing effects somehow. As far as I remember, the original game did apply post-processing effects to the HUD. Probably something to do with OpenGL not getting a decent way to do render-to-texture until 2005, so they'd have had to use the previous frame's render buffer. It wasn't that noticeable in the original though.