"Lincoln Loud: Girl Guru" is the thirty-seventh episode of The Loud House.
Lincoln and Clyde must start a business for a school project, and they need Lincoln's sisters' expertise.
Lincoln and Clyde are making chocolate pies for a business, but when Lincoln goes to get chocolate for the pies, he notices that all the chocolate is gone--Lincoln immediately deduces that his sisters, who're all notorious "chocoholics," must have eaten the chocolate. Since they can't make chocolate pies, they decide to make salt-and-vinegar pies instead (stating it works on potato chips). Artie tastes a pie, and claims it to be disgusting, making them switch to birdhouse making. The birdhouses don't go much better, because when a bird flies into it, the birdhouse collapses on it.
Then they see Luan has earned $100 by selling balloon animals, causing them to take up the idea. While Liam is looking at the horribly misshapen balloon animals and explains that he's trying to impress a girl he likes, Lincoln suggests that Liam should give his crush some chocolate, revealing that his sisters all love chocolate. Liam takes the advice, and it ends up working, which leads to Liam calling Lincoln a "Girl Guru" ("guru" essentially meaning "expert"). This gives Lincoln and Clyde the idea to start a business by having Lincoln give girl advice to people for money.
Lincoln gives people advice based on his past experience with his sisters. Later, he and Clyde see the boys trying Lincoln's advice, which ends in the girls hating the boys for doing such. This causes all of them to hate Lincoln and Clyde, vowing to cause them pain the next time they see them.
Lincoln and Clyde then leave the school and run home hiding in trash cans. When they walk inside, the sisters immediately question what they were doing, and when Lincoln explains that since he had ten sisters, he thought it wouldn't be a bad idea to use his living experience with them as advice to give to boys on how to impress girls. The moment he's done explaining himself, the girls end up laughing hysterically at the idea, pointing out that having a bunch of sisters doesn't make him a girl expert, adding that all girls are different and that what works for them might not work for other girls. Lincoln then wonders what to do now that his business is a complete failure when he hears Mr. Loud say something about tossing out Lincoln's pies, giving him an idea.
Clyde is now selling the salt and vinegar pies to people to get revenge on the "Girl Guru". Of course, everyone at the school purchases a pie, and immediately pelt Lincoln with them.
One of Lincoln's polo shirts was seen in Lily's crib, meaning its been there since the events of "Changing the Baby".
Agnes and Coach Pacowski seem to have feelings for each other, even though Agnes is referred to as Mrs. Johnson, which means she could possibly be divorced or widowed.
Moral: Assumptions don't solve problems. / Every person is different in their own way; no two people are the same.
Five Guys - "Pie Guys" is a reference to the fast food restaurant.
Wilhelm scream - When the birdhouse collapses, the well-known Wilhelm scream can be heard.
This is the first time the Wilhelm scream has been used in the series.
Nintendo 64 - In Lincoln's flashback with Lynn, he is using a controller similar to that of the Nintendo 64 console.
The Wizard of Oz - Joy's line, "Yeah, and his weird little friend too!", is a reference to the Wicked Witch of the West's line "And your little dog, too!" from this 1939 classic.
Shovel Knight - Lola's bedtime story is called "Prom Knight", which is a pun for Prom Night and possibly a take on the popular indie video game.
The boys are paying for 2 questions, but Lincoln only answers 1 question.
When Luan is counting her money earned from selling balloon animals, she is counting by ones starting with 98. But the monetary value of the bills is $20 and she has at least 7 of them, meaning she has approximately $140.
In addition, some of the 20's on the 20 dollar bills Luan is holding are mirrored.
Lincoln and Clyde saying "How hard can it be?" while trying to come up with a sale.