Continuity mistake: The bottle of Peach Schnapps that Trip (Josh Hartnett) brings to the dance is alternately full and half empty during the scene. When Trip pulls it out, it is new and unopened. He hands it to Lux to drink, at which time it is nearly empty. He then drinks from it, and it is about half-full. He next hands it to the other couple, at which time the bottle is nearly full again. (00:57:56)
Continuity mistake: When the Lisbon girls are surrounding the tree stopping the guy from cutting it down, between shots Therese's scarf changes position during shots. (01:12:00)
Continuity mistake: At Tripp's first visits to Lux's family, when he gets up to leave, Lux gets up also. She is clearly wearing light blue colored jeans. When she walks Tripp to the door, she's wearing black colored jeans or black sweatpants.
Continuity mistake: During the scene when Peter Sisten is eating dinner with the Lisbons, Cecilia is not wearing her bandages on her arms. In the scenes immediately before (Cecilia in the psychiatrist's office) and after (the girls lounging on the front yard) Cecilia has the bandages on.
Suggested correction: I'm not sure if your entry isn't correct, but I found the beginning scenes confusing and got the impression that they were not meant to be sequential. There appeared to be flashbacks after it was stated that "Cecilia was the first to go" and Cecilia told the one doctor, "Obviously... you've never been a thirteen-year-old girl." The neighborhood boys were talking about things that had happened (going over evidence), including Dominic wearing sunglasses and jumping off the roof, Peter going to dinner at the Lisbon's house, and Paul's story about getting into houses and being the first to find Cecilia on her first attempt. These seemed like tidbits about boys' behaviors that offered some explanation as to why Cecilia did not want to grow up in that kind of society. I think the story picks up again when Cecilia and two sisters are outside by the tree - where Cecilia is wearing the wrist wraps again.
Continuity mistake: When Lux is sitting outside and the guy she is with is throwing grass at her, some grass appears in a close shot, on her shoulder where there wasn't any before.
Continuity mistake: After Cecelia's tree is cut down, there is a shot of the house, and the tree is back upright again.