While Susan is giving her class report she is wearing a purple outfit. However, while Ramona is giving her class report, Susan's outfit is white and yellow.
When Beezus is upset because she just spit all over Harry after drinking a lemonade with a fly in it, Beezus is on stomach on her bed upset. She looks at Ramona and she has hoop earrings in, then the camera goes to Ramona, and back at Beezus and she doesn't have the earrings on anymore.
When Ramona and Howie wash Hobart's car, watery soap pours down the windows. At one point when the camera is on Hobart, however, there is no water on the windows or dashboard.
When Ramona and Susan are talking in the music room, Ramona's top button goes from done to undone and back and forth a few more times. By the end of the conversation it has been undone for a few shots in a row, but when she gets up and goes to the window it is done again.
When Beezus and Uncle Hobart Drop, Ramona off for the royal peanut butter auditions, She unbuckles her seat belt. But, then after the camera shows aunt Bea and uncle Hobart, Her seat belt is back on.
Just before Hobart proposes to Bea, he shows her a box full of old memorabilia that had been buried for years. The box is a Converse sneaker box of a newer sort with an attached lid. In the time frame the lost box was first buried, it would most likely have been different, with a detachable lid.
Ramona mentions to her father that they crossed a bridge when they traveled to "Washington state." No child growing up in Portland, Oregon, or anywhere in the Pacific Northwest, would have added the "state." It's just plain Washington.