First time I've chimed in on the Idol talk.

I too noticed Carly's JCS lyric flubs. By chance, that disc is actually in my car right now. My wife and I discussed what songs NOT to pick, and it seems no one listened to us. "Music of the Night", "Memory", and "Don't Cry for Me, Argentina" I wouldn't touch with a ten-foot pole. I don't think I'd touch ANYTHING from Phantom. At least no one did "Don't Cry..." What's interesting is that of the songs, 4 of the 6 switched the sexes of who sings the songs in the shows.
"One Rock and Roll Too Many" - Male/Idol - Female
"Memory" - Female/Idol - Male
"You Must Love Me" - Female/Idol - Female
"Think of Me" - Female/Idol - Male
"Superstar" - Male/Idol - Female
"The Music of the Night" - Male/Idol - Male

That being said, when Webber said he never imagined hearing a male singing "Memory", he must have forgotten that Barry Manilow had a mild hit with it in the early 1980s.