1) "Until the End of the World": The way the Edge's guitar goes off a little bit on the higher notes, before his solo, when Bono sings "In the garden I was playing the tart..." It's more prevalent in the version of the song from the movie soundtrack.
2) "Bad": Bono's "woo-hoo, woo-hoo" parts on the album version (not the version on "The Best Of," nor in most modern-day live versions -- Bono's got to sing that segment two times, the second time being more powerful than the first).
3) "Where the Streets Have No Name": After the synth and Edge intro, the part where Adam comes in, when he slides his hand down the neck... It's like an announcer at the track saying... "annnnd they're off!"
4) "No Line on the Horizon": The way the band plays during the part where Bono sings "I know a girl with a hole in her heart." Where the Edge goes into freight-train mode, like a slowed down riff from the fly, and Adam's bass rises and falls. It still gives me the chills.
That's all for now. Carry on.