Memetic Mutation: Would it be safe to say that "UUUUUUUUULLLLLLAAAAAAAAAA" has reached memetic status?
Narm: In the stage show, as shown in the 2006 live DVD. Most of the background film being synchronised with the music works really well, but the "dancing heatray" during Horsell Common looks a bit silly.
This is taken Up to Eleven in the New Generation stage show where not only is the heat ray seen "dancing" multiple times, but there are also two occasions where it thrashes around as if it was having an epileptic seizure. Luckily, they appear to have toned it back down a bit when they updated the film (again) for the Final Arena Tour.
During an emotional moment in the "Thunderchild" song ("flashing heat-rays pierced the deck"), the word "pierced" can unfortunately be misheard as "pissed".
If you don't find the cry of Ulla scary, it's going to sound awfully silly.
The Woobie: Parson Nathaniel in the cut song of the same name, in which he despairs over the loss of his church to the Martian invasion and wonders what sins he and his fallen followers have committed to deserve this punishment.