When Richard Thomas was asked to do Hyalopterous Lemure's art (Ice Age), he mistakenly drew a "Lemur" (the fuzzy mammal) instead of a "Lemure" (ghost of an unburied dead). He added wings (Hyalopterous) and the result was a cute winged creature instead of a scary ghost. A reference to this mistake was later printed on Viscid Lemures's flavor text.
Goblin King received three errata.
The Alpha version had an ambiguous text suggesting that Goblin King also got +1/+1 and mountainwalk, so the Revised Edition version was given the Lord creature type instead of Goblin King.
With the 9th Edition, Goblin King got his Goblin creature type back and the text was changed to Other Goblins get +1/+1 and have mountainwalk.".
Finally, with the 10th Edition, the Lord creature type was removed.
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