On her first day of work, Courtney complains that it's still dark outside at 5:30am. Just a day or two later in the film, her sister Taylor wakes up at 5:30 with daylight streaming in the window. The film takes place over a work week, so Daylight Savings Time could not have happened in the interim.
When the father wakes the girls up at 5:30 he plays "Reveille" on his bugle. He takes the bugle away from his mouth before music has finished playing.
In the first shot of Taylor driving her mother's car, a boom-mike is reflected on the car.