The first episode of Glee establishes much of what will go on well into the first season and some of which will go beyond. Emma has a crush on Will. Kurt and Rachel both have crushes on Finn. The slushies are there, which goes well into the fourth season. Quinn is antagonistic towards Rachel. Duets are established as showing friendships or romance, or leading to friendship or romance. Vocal Adrenaline is an important opposing team, which goes on through the third season. There's a lot set up.