I still have my theories that Rock was asked to tone down his promos a little bit so he didn't end up completely burying Cena a la Billy Gunn any time they got in a promo war with each other. Those first few promos Rock cut against Cena were golden and Cena couldn't match him what so ever, then after that it was like a switch got flipped and suddenly Rock wasn't cutting as great of promos and Cena was suddenly holding his own.
The Rock/Cena "notes on your wrist" thing felt like a very forced "See, Cena can hold his own against Rock" moment. No way in hell that Rock, a guy who was known as a promo machine during his WWE career and a guy who makes his paychecks now through memorizing lines for movies, has to write fucking cliff-notes for an 8 minute promo on his wrists.