You mean like the flickering on the shingles of that little gazebo thingy, and at the edges of white poles and lines?

That looks like "stepping", aka "stairstepping" and it needs some "anti-aliasing" aka "antialiasing".

That should be easy to search up a solution for.

That's not an issue of frame rates, or wrongfull interlacing. Although I could imagine how 60i and 24p could help disguize it (in two different ways).

It's a common problem with standard definition. The lines, in the patterns, are at angles to the tv's/monitor's scanlines. And the scanlines are "chopped up" into pixels. So the edges, of the pattern's lines look like stairsteps. As the camera moves around, the steps move around - hence flickering. It's still there, in HD, but because there are so many pixels, it isn't noticable.

Did you use the sharpen filter on downconversion for this clip? That'd make it worse.

It sounds counterintuitive, but, in a sense, you have to do something that almost un-sharpens the edges. Which would seem like the last thing you'd want to do for lower-resolution. You need the edges's pixels to be a blend of the two colors on each side of the edge... it's kinda hard to explain without a picture. I'll try to come back and edit in a link. Anyway, the human eye likes it, so it's ok.

I could swear I also see a stray blob of color on the shingles for a couple of frames, and maybe along that one tall, white vertical post. (The stepping might be overworking the encoder).

Unfortunately, the encoded clip is just too short for me to watch it on the dvd, it's slightly over a half-second.

Could you post a long, encoded clip, by itself? (If I haven't identified the problem, that is).

If I'm seeing the right problem...

I'll see if I can dig up a good solution for that. Avisynth might be your best bet, there, but I"m kinda green, on that subject. And there might be something simpler to learn.