Continuity mistake: Once Grandpa takes the underwear off Harry's head and sets it on the counter, it continually moves. Originally it is at the edge, draped over a little bit. Next it moves inward a little. After Mom shuts off the power, it is almost halfway on the counter. (00:11:40 - 00:13:00)Karoo
Continuity mistake: At the beginning of the movie, Ryan's hair is short. In the scene where he, Anna and Tess are talking about why Anna was riding on the back of Jake's motorcycle, his hair is several inches longer. At the wedding rehearsal his hair is short again, the same length it was at the beginning of the film.
Continuity mistake: When "Pink Slip" are singing "Ultimate" right at the end, you can see a small group of girls clumped together behind Anna and her girlfriends, and in the next shot they are completely gone. It's impossible for them to have moved entirely out of eyesight in those few seconds they are off camera.
Audio problem: When the band Pink Slip is performing their song at The House of Blues, near the beginning of the song, Anna's two band mates are looking at her and wondering why she isn't playing. Maddie (the lead singer) is looking at Anna and singing, but Peg (the other guitar player) is looking at Anna and not singing. However, in the song, you can hear someone singing a harmony note opposite the main melody. How could that happen if Peg wasn't singing?
Continuity mistake: Anna's friend, the lead singer in the House of Blues performance, had not very much blush on, but an overload of eyeshadow on at the rehearsal, but when she got to the House of Blues she had an overload of both. When they were actually playing and after, the blush was cut back on again.
Continuity mistake: After Anna gets out of her second detention, when the things fall out of her bag, first you can see that the bag is still on her shoulder but her bag just turned upside down. In the next shot when you see all the things on the ground, you can see the bag touching the ground. When the shot goes back to Anna you can see the bag is on her shoulder again and upside down again.
Continuity mistake: When Tess is cutting the underwear off of Harry's head, she leaves the scissors on the counter away from the pile of the pieces of the underwear. Later you can see that it is in the pile of underwear. (00:11:25)
Continuity mistake: When Tess comes in after work, there is a crisscross decoration on the wall far from the door, and there is something else next to the door. When she comes in after being out with Jake, the crisscross is directly next to the door.