Tagline: "Summon your amazing strength." -Luanne
Peggy mentions that she never went to prom, and even though she could have gone with someone ugly she stuck by her principles. However, she was dating Hank by then, so while it isn't a surprise they didn't go to prom (Hank being the way he is) I don't think the reason she didn't go with someone ugly was because of her principles, but rather it'd be cheating on Hank.
In this episode, Lucky said he slipped on pee at the Costco when he went to buy a new winch. However, in the ninth season episode "The Arlen City Bombers," Lucky says he went to the Costco to buy a big-screen TV with a cash advance from his credit card.
Jack the Barber: (Asking Luanne what prom hairstyle she wants) So what'll it be, the "Linda Evans" or the "Joan Collins"?
Hank: I've always wanted to see walnut in the wild...
(A customer is getting a new hair style for her prom)
Luanne: I missed my prom because I have to testify against my mama. Everyone got THE most romantic night of their life, and all I got was my mama sent to jail. (sighs)
Customer: I think I'll get an "up" do.
Luanne: The bailiff that had to wrestle my mama had an "up" do. (sobs and cries)
Dale: I'm so cold.
Hank: We're all cold Dale.
Bill: If we huddle together we will retain our heat and we won't get hypothermia.
Hank: Not a chance.
Bill: C'mon on Hank no one will ever know.
Hank: I will, and that's enough.
The song playing when Luanne and Kevin first dance at the prom is "Didn't You Know How Much I Loved You" by Kellie Pickler. The song Lucky and Luanne dance to at the end is "25 or 6 to 4" by Chicago.
The theme of the prom is "A Knight to Remember". This is a play on words, as proms are usually considered "a night to remember".
Luanne's hairstyle and prom gown are near replicas of the one Cinderella wore (down to the jewelry even) in the 1950 Disney animated film Cinderella.