Buffy the Vampire Slayer

Coach: After the fall of the Soviet Union, documents came into light detailing experiments with fish DNA on their Olympic swimmers. This may be a reference to the 1976 East German Olympic women's swim team. The swim team took 11 of the 13 golds and the entire East German team doubled the number of metals from the previous Olympics. When the swim team was accused of steroid use because of their big muscles and deep voices, an official famously responded; "They came to swim, not to sing." After the fall of the Iron Curtain it was revealed that they had been given steroids from the time they were pre-teens and told they were vitamins.

Buffy: I mean it's not like you were exposed more than once. (Xander looks at her) Twice? Xander: Three times a fish guy. A reference to the famous chorus of "Three Times a Lady" by The Commodores.

Xander: Breakfast of state champions.
"Breakfast of Champions" is the motto of Wheaties cereal.

Angelus: Why, Miss Summers! You're beautiful.
This is a cliche uttered by fictional bosses when their secretaries take off their glasses and let their hair down. Buffy has just removed the stick holding her bun together to stake Angelus with.

Xander: And what about that nutty, "all men are created equal" thing?
This is probably the most famous line from the Declaration of Independence: "We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness."

Buffy: Nice tat. What--did they run out of Tweety Bird?
Tweety Bird is a cute little, seemingly helpless canary who always manages to outsmart his nemesis, Sylvester the cat in the classic "Sylvester and Tweety" cartoons.

Title: Go Fish This refers to a children's card game called "Fish", in which one player asks the other if they have particular cards; if not, the other player tells the first to "go fish", i.e., to seek out that card.

Xander: Black lagoon. The creature from the blue lagoon was Brooke Shields. The Creature From the Black Lagoon is a classic horror movie from 1954 which featured a fish-man very much like the ones in this episode. The Blue Lagoon, by contrast, was a 1980 film starring Brooke Shields and Christopher Atkins.

Xander: In other words, this was no boating accident.
A line from the 1975 movie Jaws. The town sheriff tries to convince the mayor that a mangled body was caused by a shark attack and not a boating accident.

Buffy: So Cameron Walker, you just won the state semi-finals. What are you going to do next?
A play on the Disney commercial. The announcer asks the winner of a sporting event what he's going to do next and the reply is "I'm going to Disney World!"

Xander: Last month he's the freak with the Jicama breath who waxes his back.
Jicama is a Central American vegetable that is also known as a Mexican potato.

Xander: The Yankees. Abbott and Costello. The "A". Now Those were teams.
Xander enumerates a list of teams. The New York Yankees baseball team, the comedy acting team of Abbott and Costello and TV's The A Team.