I don't think it's really a conversion error, there, but it seems there is a sort of contradiction in the story.
http://archives.sluggy.com/book.php?cha ... 2013-04-10
Here Gwynn say the magic collar only change you if you say the magic word
But here, Zoe never said the magic word :
http://archives.sluggy.com/book.php?cha ... 2000-12-26
It could be explained by Gwynn being mistaken and Poopypants somehow messing with her mind, as well as the Collar itself, as he set it to activate at his own convenient time, but I find it strange that in one case The curse took on simply putting the collar, but then here
http://archives.sluggy.com/book.php?cha ... 2013-04-01
Kron had to actually say "Shupid".
I don't know if Pete intend for Zoe to accidentally say Shupid, but then forgot. At this point, I don't know where Gwynn go the idea you had to say the word to activate it.