Lincoln gets a tutor that all his sisters instantly get crushes on, making it impossible for him to study.
Lincoln and Clyde are walking home from school, and Lincoln is upset at the fact that he just got an "F" on his latest test. Because of this, Lincoln fears that he will fail the fifth grade. Lincoln realizes that in order to improve his grades, he needs a tutor. At first, he tries get Lisa to tutor him but Lisa's unable to do so as her tutoring schedule is already filled up. However, still wanting to help her brother, Lisa suggests that Lincoln should get a tutor through the local community college as she claims that students there tutor others to get extra credit for their classes. Lincoln accepts this suggestion and heads off to find a tutor.
Sometime later, Hugh, Lincoln's tutor, arrives. As the two sit down and begin, Lori walks into the room, and inadvertently lays eyes on Hugh. Almost immediately, she swoons over him. Eventually, all the other sisters arrive (with the exception of Lily), and immediately fall head over heels for him. As the sisters and pets (expect Geo) begin to crowd around Hugh, Lincoln quickly drags him out.
Lincoln and Hugh try to begin their lessons, but every room they go to the sisters are there, eavesdropping on the two, much to Lincoln's frustration. Eventually, the last place they try to get some progress done is in Charles' doghouse. Unfortunately, the sisters find out about Hugh's location and attempt to enter the doghouse, inadvertently destroying it. Infuriated, Lincoln calls for a family meeting. Inside the house, Lincoln chews out his sisters and father for their behavior before ordering them to leave him and Hugh alone so that he can prepare for his upcoming test, which they begrudgingly do so.
With the sisters out of the way, Lincoln and Hugh are able to make progress. Hugh discovers that Lincoln is a really smart person, as he's able to know all the answers to his questions. Because of this, Hugh declares that his work here is done and leaves (by being chased out by Lincoln's madly in love sisters and their British-obsessed father).
The next day, Lincoln comes back from school and is disappointed to learn that he flunked his test again. As Lincoln plops down on the floor in defeat, he unintentionally mentions his substitute teacher's name; Ms. DiMartino. When the sisters hear Lincoln say her name, Luna tells him that Ms. DiMartino is so attractive that all the boys fall head over heels for her. Lincoln explains that Mrs. Johnson broke her leg after riding on a mechanical bull, so she hired a substitute to take cover for her. In a series of flashbacks, Ms. DiMartino's attractive looks made Lincoln lose all of his focus. This makes Lincoln realize that these distractions are what's causing him to repeatedly fail his test. Lisa has the solution: Lincoln simply has to NOT look at her. She proves this correct on Lori by asking her what Bobby's full name is. Lori tries to answer, but Lisa repeatedly shows her the picture of Hugh, causing her to lose her focus and start all over. Lisa then deletes the photo of Hugh, allowing Lori to answer the question without losing her focus. Realizing that it might work, Lincoln heads back to school.
At school, Ms. DiMartino allows Lincoln to retake the test, but this time Lincoln takes the test in his locker to avoid making eye contact with her. After taking the test, Lincoln finally gets an "A". Lincoln believes that he will see Ms. DiMartino in the classroom, so he shields his eyes when he walks in, but to his surprise Mrs. Johnson is back, albeit on a wheelchair.
During gym class, Lincoln is confident that he won't get to see Ms. DiMartino again in another one of his classes. However, it's revealed that Ms. DiMartino will be subbing for Coach Pacowski, whose foot got run over by Mrs. Johnson's wheelchair. Because of this, all the boys immediately get distracted by her attractive looks.
This is Clyde's last appearance of the first season.
This is the second episode where the title card doesn't have a solid color for a background, the first being "The Sweet Spot".
This is the second time the Loud sisters blush, the first being "Linc or Swim".
This is also the first time Lisa blushes.
This episode reveals that Lola's eyes are blue.
Lynn Sr.'s mouth was seen in this episode, although the rest of his face is covered by a royal guard's hat.
In addition, his name is revealed in this episode.
Bobby's full name is revealed to be "Roberto Alejandro Martinez Millan Luis Santiago, Jr.", which means that he is named after his father, or one of his grandfathers. This trait is also shared with Lynn Jr.
Bobby and Coach Pacowski are mentioned in this episode, but do not appear physically.
Geo was the only pet who wasn't obsessed with Hugh, as he did not appear in this episode.
Only 9 Loud sisters get crushes on Hugh, as Lily was absent in this episode.
So far, this is the only episode where Lori falls for someone other than Bobby.
It is revealed that Lana has a space in Charles' house, provided with a doggie bowl with her name on it.
It is revealed that Lisa tutors Lori (for precalculus), Lynn (for geology), Lucy (for math), Lola (for biology), and Lily (for finger-painting).
It is revealed that Lincoln is such a good student, and doesn't need Lisa's tutoring.
This is the fourth time Lincoln doesn't speak to the viewers.
This episode reveals that Clyde thinks he will become a rebellious punk if he doesn't go to middle school with Lincoln.
When the Loud sisters were fighting over who won Hugh's heart, an actual eyeball can be seen flying out of the dust cloud. In addition, a fish can be seen flying out as well.
One of Lynn Sr.'s British sayings is "fish and chips" which is a known English dish mostly eaten in the great part of Europe.
In the Latin American dub; when Lincoln speak with his sisters, when he calls for a family meeting; beginning his sentence with "You guys are unbelievable!", he talks in third person ("My sisters are unbelievable!"), Leni still replies to his statement, though.
Moral: Don't let any beauty distract you from your duties. / Don't cheat your heart.
Study Muffin - The title is a parody of the phrase "stud muffin", a slang term that means a very attractive young man.
Just Dance 2 - The song "Why Oh Why" plays in the background during parts of the episode.
Duck face - When Lisa deletes Hugh's picture from Lori' cellphone, it shows Lori's wallpaper is a selfie doing the infamous duck face gesture.
Keep Calm and Carry On - On Lisa's desk, there's a poster stick on the right side saying "Keep Calm and Do More Calculus" which is a reference to the infamous motivational poster, which became an Internet meme.
Near the end when Lincoln is about to go into the classroom, Clyde is standing behind him, but when he enters the room in the next shot, we see him from the front, but Clyde has mysteriously disappeared.
Lori is one of the sisters who fell for Hugh, and Lincoln kept swooning over Ms. DiMartino, but they are both dating Bobby and Ronnie Anne respectively, and falling for others could really ruin their relationship.
When Lincoln and Clyde approach the classroom, Lincoln's test disappears.
When Lincoln, Clyde, Liam, Zach, and Rusty fall in the trash, Rusty was speaking, but Liam was heard.
When the sisters are fighting to try to get to Hugh, Lori is holding Luan's ponytail, and her arm is shown to be extremely long.
When the sisters are chasing after Hugh, Lori's eyelashes are missing.
When Ms. DiMartino hands Lincoln his exam through his locker, her left leg is badly drawn.