Bridget and Marks' confessions to one another, especially in the 1st film, shows a lot of Character Development when the haughty and strait laced Mark and the insecure and self-deprecating Bridget are willing to just grab the bull by the horns and heart and open themselves up in a way that could leave them vulnerable to heartbreak.
Jude also calls out the behavior of Smug Married couples in her wedding toast when she thanks Bridget and Shazzer for being her best girlfriends who have her permission to ask about her sex life if she ever asks the dreaded question "How's your love life?" Cue many quiet married couples in attendence politely clapping.
She defends her form of parenting when Wallacker (likely either failing to understand her POV and thinking she's like all those other vacuous and shallow Moms) tries to tell her off for coddling Billy and not disciplining her kids enough, she says that she won't send her kids off to boarding school like he does since kids need their parents affection and attention.
Renee Zellweger's acting in the films are a Real Life example. There were doubts expressed that the Texan-born American Sweetheart would accurately portray a white-collar, middle-class single English woman. Well she worked on her accent, while working in an English publishing house for a year, to the point that her British co-stars were convinced she must actually be from the UK.