I took some screenshots of The Flash tonight using my capture device. Note that the images will be somewhat compressed, due to the nature of my device, but the effect I was describing is still noticeable. It's most noticeable around the edges of the CW logo, but also noticeable on other prominent edges. The last image for some reason isn't showing the same artifacts, and appears to be displaying all edges properly, however it does look blurry, so it may have some deinterlacing being applied by my receiver for some reason (even though it outputs in 1080i). I tested whether a field swap would fix the issue, and it did not help. Deinterlacing does help smooth the edges better, so obviously the issue is happening on alternating fields, but I'm not quite sure what the issue is.