Twilight Princess does that to me once in a while (flickering). It actually looks like a nasty camera glitch.. it flickers, but that's not all. It's irritating, and I haven't found anybody else with the issue. I'd say it was a bad dump, but I dumped it from my own original disc, twice. Plus, a bad dump would be consistently bad, not randomly bad on occasion.
I'm not quite sure what your "flickering" looks like, but it could be related to the interference caused by certain hard drive power supplies... The topic is somewhere around here if you want to dig it up.