"Miss Jean Louise, stand up. Your father's passin'," as mentioned on the Tear Jerker page.
"Thank you, Arthur. Thank you for my children."
For his performance as Atticus, Harper Lee gave Gregory Peck a pocket watch that belonged to her father, the man Atticus was based on. When Peck accepted his Best Actor award, he was wearing the watch.
For added points, the watch was stolen from Peck's bag at a train station one day, and he was so ashamed that for years he didn't admit it to Lee. When she finally did find out, however, she didn't make a big deal of it because: "It's just a watch."
Jem refusing to leave his father even when Atticus tells him to during the scene outside the jail, and, rather than rebuke him for it afterward, Atticus goes with an Affectionate Gesture to the Head as they leave.
Mary Badham, who played Scout in the film, kept in contact with Gregory Peck after the filming ended. She would always call him "Atticus".
Though we don't see it, it's implied that Jem was injured trying to protect Scout from Bob Ewell. A 12-year-old boy fighting a grown man for his little sister.
The scene added for the film where Scout and Jem discuss their memories of their mother, as Atticus silently listens.
The Sheriff lying to protect Arthur Radley and saying how he did the town a big service.
Bob Ewell's death. He was murdered to prevent him from killing children, and Mayella Ewell can be free from his influence.
"He would be there all night, and he would be there when Jem waked up in the morning."
This troper's heart was warmed when Scout, following Jem's injuries towards the end of the book, hovered around the adults repeatedly asking if Jem was dead, with no other questions or comments, and she was not satisfied until she got to see him for herself.
While the jury was out, Scout remembered that Jem had told her that if enough people concentrated on setting a tree on fire, the tree would ignite. So she thinks about telling everyone to think about Tom being acquitted.
Doubling as a Tear Jerker, Mayella Ewell saves up her money for a year so that she can buy ice cream for all of her siblings. It's a brief glimpse of the young woman she could have become if not for her nightmarish home life.
May double as a Tear Jerker. When Atticus agrees to defend Tom, he knows full well that the young man can't pay for legal fees. After the first day of the trial, the Finch children wake up and go outside...and discover that the entire African-American population of the town has been up all night preparing food to leave anonymously on the back porch. It's such a simple gesture, but it means so much.
A small one, but the fact that Cal and Atticus once sat down to try to figure out how old she is by comparing memories. Most employers of the time wouldn't have bothered.