That 'interlace effect' is combing and pops up when the deinterlacer (eitehr in a display or an encoder) does a poor job of deinterlacing an interlaced signal.
How can there can be combing on the actual video when it outputs a progressive scan image (1280x720 as opposed to 480i), not an interlaced one?
My guess is that even in the direct feed videos, at some point they were in an interlaced format and reencoded. Also, wouldnt direct feed mean a 1280x720 video, pixel perfect of whats ont he screen? Dont hink ive seen one fo those from TGS yet.
So in summary, these are deinterlacing artifacts or artifacts frmo scaling the 1280x720 image down to wahtever video size youre viewing.
J