A few things that bothered me
Gillian Anderson's unnecessary introduction (PBS broadcast of all the Austen films). She sounds like she's talking to a group of fifteen-year-olds who have never read a book, and have been persuaded to sit down and stop playing with their cell phones for eighty minutes.
The distinctly soap opera acting going on during the Crawfords' first visit.
Edmund's sister doing a modern runway-model-style bitch walk as she went out to get into the carriage after being married.
Fanny's blonde hair but giant Laura San Giacomo black eyebrows.
The aunt's wheezy manner of talking. Does she have emphysema?
The severe abridgement that made the movie seem somewhat like a trailer, particularly the omission of Fanny's visit to her poverty stricken family (most likely the usual PBS butchering job).
The hand-held bobbing, swerving, jumping, and jiggling camera (which was even worse in "Persuasion"). But I guess the young people like this.
The ubiquitous conversation during a dance, which was cleverly done in the Ehle/Firth "Pride and Prejudice" but has been turned into a cliche by nearly every Austen adaptation since.
Fanny's continually running about the house like a wild child, in spite of the fact that she's old enough to be a bit more adult in behavior.
The fact that Fanny hardly ever seemed to change her clothes.
The unlikely youthfulness of Edmund's mother, considering his older brother appeared to be at least thirty, and she seemed less than forty.