I will not discuss the song Clocks, supposing that you have already heard it by now.
Crests of Waves and Animals capture Coldplay wearing their Echo & The Bunnymen influence on their sleeves. And their inclusion onto A Rush of Blood To The Head would have added some much-needed diversity since they are both far more bouyant than most of the album's songs.
The live recording of Yellow, strangely enough, doesn't seem to have an audience. It's just Chris Martin singing along with his piano, nothing else. I myself prefer the full band version.
The live recording of In My Place is a little on the messy side when it comes to mixing. Martin's voice gets a little off-key at times and the crowd, at one point in the beginning, becomes louder than the band. Aside from those details, it sounds just like the album version.