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When Kristy's stepfather (of whom she was once very resentful) has a heart attack, she tells the 911 operator that "Something is wrong with my dad!"
Throughout the series, Watson rarely refers to Kristy as "my stepdaughter." Even when he's writing to a relative of his, he refers to her as "my daughter."
Byron finally deciding to befriend Nicky in a later book.
When Claudia is accused of cheating on a math test, her parents say that they would "like to believe" her when she says that she's innocent. Her older sister Janine says, "I do believe you," and is so vehement in her defense of Claudia that she makes their parents ashamed of the fact that they had ever doubted her.
Doubly heartwarming is the fact that the reason she knows is that she went out of her way to help Claudia study for the test and at the beginning of the book, was seen praising her little sister warmly at her successes on the practice test.
Janine again: When Claudia wins a contest to host a radio program for a few weeks, her parents ask her questions like "Will this interfere with your schoolwork?" (legit) and "Will you be paid?" (not legit) Janine? Runs to the kitchen for champagne glasses and sparkling cider.
"A toast to Claudia, the first media celebrity in the family!"
There is a very touching moment at the end of Boy-Crazy Stacey, when the girls have returned from their various two-week vacations. Stacey and Mary Anne have been away in Sea City with the Pike family, and Stacey is dying to call Claudia and tell her about getting her first kiss. But she forces herself to hold off and call Mary Anne, who went on her first date during the time away, because she thinks Mary Anne may need her more.
In the first book, Kristy bonding with Karen and Andrew, who she had initially wanted nothing to do with before getting to know them.
In Jessi's Secret Language, Jessi is babysitting for Matt Braddock, who is deaf. She introduces Matt to the neighborhood kids, and they start playing baseball. During an argument about a play, Jessi notices that the kids are arguing verbally, and is about to remind them to sign as well so that Matt can follow along, but before she can, the kids themselves back up and start the argument over again, this time with sign language. Later on, Jessi observes that they've stopped talking entirely, and are just signing instead along with Matt.