it was too easy to see, so it's not really subliminal advertizing. it looked like it was more than just 1 frame to me.
it may be an internet hoax where it never happened and the youtube guy is trying to stir things up. did anyone else report seeing or recording it?
if it did truely go out on air, there could have been a dozen or more places that the mickey d's frame was inserted mistakenly by a tech or computer somewhere. if so, you'd have thought the tape editors would have seen it and cut it out. or maybe they were having a big mac attack and didn't notice.