I found another glitch.
SPRITE SCALE 200 3 159 159 HiddenTile.gif
ON KEYDOWN
x = x + 1
SPRITE 2 x y Adventurer Avatar.gif
END KEYDOWN
Whenever you press a key the SPRITE keeps on getting bigger. Until Its so big that it disappears.
EDIT A nice feature of the sprite scale command would be a sprite x scale and a sprite y scale so you could make long and tall sprites.