The sports teams at Mount Rose High School are called the "Muskies." This is in reference to the muskellunge, a fish found in northern Minnesota, whose name derives from the Ojibwa word for "ugly pike."
The movie makes multiple references to traditional Minnesota food: The Mount Rose High cafeteria serves lutefisk for lunch, Jell-O salad is served at Tammy's funeral, and several scenes include people eating and offering "bars," considered an essential dessert for Minnesota potlucks.
When Becky visits Mary at the hospital, Amber is combing her hair and a chunk falls out. Amber places the chunk back on Mary's crown. When Becky enters, Mary is suddenly wearing a tiara and the chunk of hair is hanging in front of her nightgown. There wouldn't have been time for Amber to have picked up the tiara from the dresser and fixed her hair.