Episode 4... The way they mentioned the thing with bleach and ammonia without explicitly identifying them was a little odd.
Fun fact, I first thought the boy Blue-Hair likes was Blue-Hair's mother. I figured out what Blue Hair's wish was going to be before I realized he was a guy... It doesn't help things when Madoka's mother is about as short as Madoka.
That open-design CD player looks cool, but thinking about it, it's gotta be rather impractical.
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There never was a post. Swamp gas from a weather balloon was trapped in a thermal pocket and refracted the light from Venus.