How Archer claims that he doesn't deserve the standing ovation despite catching the criminal he wanted. Listing the names of those who were shot by Castor in the shootout. Even if Archer acts the part of the Cowboy Cop, this shows that at the very least, he thinks that those who die are much more important than himself.
Archer's brief camaraderie with Dubov. He tries to help him escape the prison (despite probably putting him there in the first place) and tries to save him at the risk of his own life and escape.
Archer: Dubov...I didn't touch your wife, and I didn't touch your sister. But I know your wife loves you and is waiting for you. So, let's get out of here.
During the raid on Dietrich's, Archer does his best to avoid killing or harming his fellow agents. If you watch carefully, he only wounds three agentsnote knocks out two (including Buzz) and kneecaps one, and all non-fatally.
He also tries to minimize the fatalities when he escapes from the prison, opting to disable (albeitpainfully) the guards and stop Dubov from killing all of them.
Castor's love and protectiveness of his little brother, Pollux.
Pollux can't tie his own shoelaces, so Castor does it for him.
"If I didn't love you so damn much, I'd have to kill you, lil bro."
Also, Castor goes crazier than before after Pollux falls to his death.
He even lovingly ties his little brother's shoes one last time after Archer kills him.
Archer, his real face restored, comes home. The shot then changes to show that he has adopted Castor Troy's son Adam. Mother and daughter? ...are overcome by tears.
The Series
In season 5, Tate accidentally drops his heavy mold onto one of his fingers and completely smashes it, forcing him to go to the hospital. Not knowing how long he'll be gone and realizing that he has a huge sculpt to prepare, everyone who has time to spare begins opening and cleaning out his mold. They even manage to get a layer of latex in it by the time he returns.
Better yet, pay attention to the order in which we see people start helping. The first two people are Roy, who has immunity and thus nothing to lose, and Laura, who (while it's not explicitly pointed out in the episode) owed Tate a favor from the Frankenstein challenge. The third one to join in, and the first to do it despite having no responsibility and everything to lose? Frank, season 1's serial jackass, handily demonstrating his full commitment to being a better person.
When Laney was suffering from homesickness in Season 5, the other contestants' instincts was to close ranks around her.
Seeing each season's final trio reunited with their loved ones as a pre-Grand Finale prize, either via Skype or in person.
It's a small thing, but whenever a contestant thanks their model after the judges' critique
In season 8, Ben, one of the contestants, proposes to his girlfriend after his first spotlight win, as he had promised himself.
In season 12, seeing team Twisted Six finally win a challenge after five straight weeks of losing people is a mild example.
