In the book, Melanie takes in an old scruffy homeless man who becomes a sort-of bodyguard, and is absolutely devoted to Melanie despite his rather gruff misanthropic and misogynist manner:
India to Melanie: "I think he’d really like for somebody to insult you, so he could kill them to show his respect for you."
Scarlett getting mad at Rhett during the escape from Atlanta when he tells her they will be parting ways. She starts hurling insults at him and he just laughs and gives this awesome reply:
Rhett: Never mind the rest, I follow your general idea.
Grandpa Merriwether suffering the meetings of the ladies' associations in his house, especially when the ladies argue over whether to care for local graves of Yankee soldiers:
Grandpa Merriwether, who had been banished to the kitchen, reported afterwards that the noise sounded just like the opening guns of the battle of Franklin. And, he added, he guessed it was a dinged sight safer to be present at the battle of Franklin than at the ladies’ meeting.
Scarlett's impulsive response when Rhett propositions her to become his mistress. She gets pissed off not because he insulted her honor, but because he insulted her with a deal she would get nothing out of (besides maybe a bunch of brats).
Even funnier, she storms off into the house and attempts to slam the door on him, but it's too heavy for her to do so. He offers, in a very gentlemany fashion, to assist her. She stomps up the stairs and hears him slamming the door hard on her behalf.
In a dark example, Scarlett's first husband and Melanie's brother dies in the war... from a case of pneumonia and measles. The letter of the news says he died a heroic death nonetheless.
And in the scene right afterward Scarlett cries on her bed, not for her deceased husband, but because she has to wear black and can't go to parties because she's in "mourning".
The moment between Rhett and Dr. Meade, when the good doctor remarks that "Old Joe" will hold the Yankees off at the mountains, nevermind how outnumbered the Confederate army is, because mountains have been the stronghold of people under attack since ancient times.
Dr. Meade: Think of Thermopylae!
Rhett: They died to the last man at Thermopylae, did they not?
When Dr. Meade then gets angry, Rhett calmly claims he wasn't being insulting, merely seeking information.
The soldier Dr. Meade is tending to when Scarlett arrives to ask him to come help deliver Melanie seems to be in a spectacular mood given the circumstances. When the good doctor begins cursing the Yankees, the soldier rather cheerfully exclaims: "Give 'em hell, doctor!" He also seems to get rather invested in Scarlett and Melanie's predicament during the short period of time Scarlett is around him.