タイフーン
The narrator’s disappointment that the old man’s story’s ending wasn’t more edgy or avant-garde actually explains a lot of the story endings in this book. Including this one. Why’d the old man have to be found crushed in the next town!?
I liked the whimsey of taking a silly common thing like people insisting on using umbrellas in heavy storms and turning it into a magical secret, though. One particular intersection next to my apartment building gets extremely windy during storms, it would be nice to use it as an umbrella launchpad 
私は名前で呼んでる
I had to read this one twice because I struggled to follow what was happening the first time around, especially towards the second half. Definitely a bizarre story, though it clicked better once I realized that she was fully confusing the curtain for a real being and not just acknowledging that it kind of looked like a person. When she suddenly goes outside, starts skipping around and crying out 「シューダダダ」 (they’re shoes?? or is it a song?) I went back to being unsure.
I’m with @pocketcat that she might have been experiencing some kind of mental break. I think there was a real boyfriend and thoughts of him start to blur together with the imaginary friend until she’s fully thinking about it rather than him. She references interaction with a third person 彼女 when thinking about 彼, which she doesn’t do with the curtain.
She’s definitely talking about her curtain friend in the childhood memory when it appeared during the summer that both of her parents were gone. Maybe the simulacra problem she has gets worse as she gets more lonely. It might explain why a bad breakup would make her believe a building + window cleaning gondola was a giant friend.
I also liked the naïveté with which the guy professed his everlasting love to her before checking whether she’s cray cray.