Sure, I understand its purpose in the narrative - Sputnik certainly feels like a lonely piece; three characters in an incomplete love triangle, sharing the title in the way they attempt to connect but fail to do so because their love is unrequited.
All very interesting, but to what purpose. Maybe MG can help me out to that end? :)
Anyhoo, two particular elements caught my eye:
1. Murakami's choice of character reactions - they're just so perfect, to the point, and well defined. Take this example (Page 51) of Miu's reaction to Sumire:
"You know I've never thought I wanted to be somebody else," Sumire blurted out once, perhaps urged on by the more-than-usual amount of wine she'd drunk. "But sometimes I think how nice it would be to be like you."
Miu held her breath for a moment. Then she picked up her wineglass and took a sip. For a second, the light dyed her eyes the crimson of the wine. Her face was drained of its usual expression.
"I'm sure you don't know this," she said calmly, returning her glass to the table...
2. An absolute brilliant use of Simile to show meaning that is also linked in with the preceding dialogue:
"Hey, if you can't give your opinion about other people, the world would turn into a pretty scary place, wouldn't it? If you don't think so, just look up what Joseph Stalin did."
On the other end of the line Sumire was silent for a long time. A heavy silence like dead souls on the Eastern Front.
"Hello?" I asked.