Plot hole: Henry gave Principal Wilder reasons he believed Christina was being abused: "Bruises, exhaustion, decreasing school performance." When Susan confronted Glenn near the treehouse, she said, "I know what you've done. Emergency room visits, school absences, bruises..." Neither had any concrete evidence/proof. Emergency room visits should have resulted in detection or suspicion of abuse if that's what doctors or nurses believed, and they are among the mandatory reporters. Maybe Henry was wrong. (00:20:35 - 01:30:30)
Continuity mistake: There's a vase of yellow flowers to the right of the helium "Happy Birthday" balloon (and screen). When Ashley gets up to answer the door, she walks past the balloon and the vase of flowers should be visible but is not. (00:01:40 - 00:02:28)
Continuity mistake: While Jim is narrating his story, he gets to the point when his son was hit by a drunk driver. The line slows down, but when it cuts to a close-up of Renée Zellweger saying "Sorry Jim", you see the trays shift. Only, they are back in the exact same spot as before when the close-up is over. (00:28:20)