A karakasa only has one eye and one leg, and a long tongue. Kogasa usually has one eye closed, her tongue showing, and only one leg extended. Even when her eyes are open, it still has the illusion of only having one eye, because only one is bright red while the other one is the same color as almost everything else.
As for a new crazy thing I noticed: a friend of mine asked why the fairies were shooting at the main character, and although at first I dismissed it as "because there wouldn't be a game otherwise," it got me thinking. In most of the games, the first few waves of fairies either don't shoot at all, or just shoot sparsely and randomly without paying attention to where the character is. Maybe the rest of the fairies notice you shooting those ones, so they decide to shoot back because you (temporarily) killed their friends.