The Rock injured:
The official explanation as to why The Rock was not at Raw is because he suffered an injury at Wrestlemania and had gone home to get it taken care of immediately, so his movie schedule is not interrupted. During his match with John Cena he is said to have tore his abdomen and adductor muscles. Rock wrote on Twitter…

“In the middle of last nights Wrestlemania match I tore my abdomen & adductor muscles off the bone. Just part of the job. But as we know It’s all about #JustBringIt. WWE Universe THANK YOU for all the love & well wishes. Means everything to me. #LeaveItAllInTheRing”

Raw had to be rewritten accordingly.

This also means The Rock won’t be taking part in Extreme Rules as originally planned.

CM Punk out selling Wrestlemania:
The reason why CM Punk was off Raw was likely to sell the match from Wrestlemania and to take a much deserved break. Although he was not injured during his match of the night with Undertaker, he was obviously banged up, especially from the table spot.