When I was playing my new quest, Atari Zelda, I experienced a rather annoying glitch in the big map on the active subscreen, and it always happens in level 1 oddly enough.
To find my Atari Zelda Quest, click the blue link in my signature.
As I would go through the overworld getting as many items as possible before level 1, it would even result in 8 screens being marked at the top of the map, when they're not even supposed to be there, as those non-existent screens are not on the level 1 map in this quest.
Note that this quest is a remake of the 1st Quest.
EDIT: It turns out my quests aren't the only ones to experience this glitch, as I saw this glitch in the default 1st quest as well.