Found some errors.

r101 Golden Mirror (30149)
&
r101 Whinny Stained Glass Window (30150)

...should both be in the "Symol Hole" category in the "Special list" section.

Also, I noticed that the "Plot Prizes" section is mentioning the following items: Ummagine Cake, Ummagine Cap, Ummagine T-Shirt and Ummagine Plushie. It says these items were given out as a prize, which is not true. They were used as clues in the Neopet V2 plot, only one of each item exist and these items were never available to the general Neopian public (meaning: they should be on NI, but not in the category "Plot Prizes").