Mr. Ewell follows Scout and Jem on their way home and then attempts to murder them. Boo Radley has also been watching the children for a long time, but not in a hostile or creepy way. He's bored, so he leaves them gifts, and he protects them.
Mr. Ewell attempts to kill Scout and Jem near the end of the book. Mr. Ewell also abuses his daughter Mayella, although she's in her late teens and not technically a child. It's not onscreen, but Mayella talks about it during the trial against Tom Robinson. If I remember correctly, it's kinda implied that Boo Radley's father was abusive as well.
A rape trial makes up the bulk of the novel and film. While the accused is innocent, it's implied that nineteen year old Mayella's REAL rapist is her father.
No, but Scout mentions that she tried to kick someone in the shins but kicked too high instead, which heavily implies she kicked the person in the crotch.
A black man wrongfully convicted of sexual assault is shot trying to escape from prison. There was also an attempted lynching, but no one actually gets hurt in that scene, it's just threats.
It's told through the lens of a child sneaking into the courthouse who doesn't really know much about what's being discussed, but a rape trial takes place during the book, and a character uses the word rutting" to describe what happened. That's as explicit as it gets as far as sexual content goes, but unless you're familiar with deer, looking up what rutting is might bring up some questions.
Bittersweet ending. The trial is Lost, Tom Robinson dies, Jem is attacked, but Scout finally understands empathy (especially towards Boo), the main lesson she's been trying to learn over the course of the novel.