The Fashion Club PSAT scores:
Sandi: 920 (but she says 956)
Quinn: 955
Stacy: 940
Tiffany: 902

Jodie's summer plans: Two internships, volunteer community service (the soup kitchen and the crisis center), a part-time job, and golf lessons.

Daria spends the first part of the summer mostly in bed. It's not her normal habit to sleep in past noon. She's said several times before that she's not depressed, but after DDMD who'd blame her for being that way?

Eric has a niece named Jasmine.

One of the campers observes that Daria bites her nails.

Daria's reading during the lanyard making is Fifth Business, by Robertson Davies (volume 1 of the Deptford Trilogy).
It's in an autobiographical style where the protagonist, Dunsten Ramsey, details his life. He's sensitive and passive, content to live out life observing rather than participating. His life is contrasted with that of his friend, Boy Staunton.
It all starts off with an important episode that changes Ramsey's life, but isn't fully worked out till the end.
Defintely a commentary on the movie's plot.

During one of the scenes where Jodie is talking to Mack on the phone, there's a poster behind her that reads "8th Annual Carvinal for Dyslexia." Note spelling.

Mr. DeMartino's outburst about "I can't take it anymore" may be a reference to the Network, a 1976 movie about a TV network that exploits the ravings of a tired-of-it-all reporter for ratings. Features some very memorable moments ("Yesterday, I announced on this program that I was going to commit public suicide, admittedly, an act of madness. Well, I'll tell you what happened. I just ran out of bullshit.").
The relevant line is:
"So I want you to get up now. I want all of you to get up out of your chairs. I want you to get up right now and go to the window, open it, and stick your head out, and yell, 'I'm as mad as hell, and I'm not going to take this anymore!' Things have got to change. But first, you've gotta get mad!"

Mr. DeMartino throwing the sink out the window is a reference to One Flew Over the Cuckoo's Nest, a book about a mental institution and what goes on inside. In the book, a great big indian guy pulls up a water fountain and tosses it through a window to escape.

Daria was reading Orwell at age 12. Not really surprising, she's make Orwell references before.

Kevin and Brittany are really pale for having done life-guard duty most of the summer.

Trent's inspiration in the van:
Betrayal, yeah, stab in the back.
Betrayal, yeah, I'm stretched out on the rack
Betrayal, yeah, thrown out of the pack.
Betrayal, betrayal, yeah, betrayal, betrayal.
Betrayal, yeah, you ruined my life
Betrayal, yeah, you're twisting the knife.

At the conclusion, Quinn answers a question from Mr. DiMartino about Manifest Destiny. This is the same question that Daria answers on her first day of school in "Esteemsters."