In one scene, Carrie tells Mary-Kate: "I know you're jealous because Ashley has a boyfriend, but your time will come." In another scene, Ashley tells Mary-Kate: "You're jealous because I have a boyfriend and you don't." The goof is that both scenes took place BEFORE Pokey admitted he liked Ashley.
In one scene, Ashley confronts Pokey because she thinks he asked Mary-Kate on a date. But in this scene, Ashley and Pokey hadn't started dating yet, Pokey could go out with Mary-Kate if he wanted to, but Ashley acts like if he was cheating on her.
In real life, Kevin would probably have been in a huge heap of trouble with his University if any rumors were out that he was dating a student. For that matter, having one of his students as his children's babysitter was also very inappropriate.
Goof: In the window of the coffee shop, the I is missing from CHICAGO.
When Mary-Kate changes the time on the clock by 10 minutes, Kevin switches it back by 20.
Taylor noticed that Ashley's handwriting was much neater than Mary-Kate's. I think that should have been a clue that he was tutoring the wrong twin.
Wouldn't Taylor have been able to know that he was tutoring Ashley instead of Mary-Kate, especially if Mary-Kate's grades were as bad as they say they were? They wouldn't improve that much with just one tutoring session.
Goof: When Carrie leaves the house after baby-sitting the girls for the first time, they are in their room talking to their dad about how great she is. Mary-Kate says "On Wednesday, she even had me doing extra credit." How is that possible if this was the first night Carrie baby-sat?
In the girls' bedroom, they have a big original movie poster for the 1997 blockbuster film "Titanic," which was very popular at the time that this episode was filmed. The poster stayed there for the entire series.