"My parents, Johnny repeated doggedly, did they ask about me?" A difference between Dally and Johnny is that Johnny still wishes for his parents to care about him. Dally has moved on; and he doesn't care what his parents think.
" I killed him. Johnny said slowly. I killed that boy." Johnny and Dally will both do whatever they can to protect a member of the gang. They would do it even if they know it could get them in trouble. They act this was because they feel like the gang is the only family they have, so they'll protect them at all costs.
"No wonder Johnny was hurt because his parents didn't want him. Dally could take it-Dally was of the breed that could take anything, because he was hard and tough, and when he wasn't, he could turn hard and tough." Dally has spent many years in NYC and in and out of jail. He has seen and done many bad things. He's been hardened by the life of crime he chose; and all in time in jail. Johnny isn't cold, or hardened like Dally yet.
"...I figured Southern gentleman had nothing on Johnny Cade." Johnny was dying a hero, and would be remembered as a good kid; not only by the gang, but by the public too. Johnny took pride in being recognized for his brave actions at the church.
Johnny and Dally both know that their parents don't care about them; or what they do. Johnny isn't even at his own house most of the time. "No wonder Johnny didn't want to see her. No wonder he stayed overnight at Two-Bit's or at our house, and slept in the vacant lot in good weather."
"I knew he would be dead, because Dally Winston wanted to be dead and he always got what he wanted." Dally was ready to die, but didn't want to commit suicide; so he forced his death by pointing a gun that wasn't loaded at the police. While Johnny was lying in the hospital bed he told Pony that even though he always used to talk about suicide, he wasn't ready to go yet. He had realized how short 16 years really was, and he wished he could've seen more of the world.