According to Richard Linklater, the film is a continuation of Boyhood (2014) in terms of beginning right where Boyhood (2014) ends with a guy showing up at college and meeting his new roommates and a girl.
Richard Linklater did in fact play baseball in his school years. He always remembered how everyone in his team were competitors and would compete at just about anything to prove who was better. A lot of this film is autobiographical like many of his films and just like in this film, he remembered what was great about those days wasn't just about the baseball games but mainly the things he and his team mates got up to.
The credits list Bernie Tiede as the cat wrangler. Bernie Tiede is the real-life subject of a previous Richard Linklater movie called Bernie (2011). In that movie, Bernie kills someone and stores the body in a freezer. In this movie, the one cat that needed wrangling jumped out of the refrigerator when the door was opened.
In one of the Saturday night scenes, there is a punk rock concert where the band play the Gilligan's Island (1964) theme song. This is one of the many links to Dazed and Confused (1993) as in that film while in school they try to list all of the Gilligan's Island (1964) episodes and proceed to have a conversation about it in the restroom.
After sex, Finn (Glenn Powell) predicts the Astros will go to the 1980 World Series. While they did make it to the NLCS, they lost to the Phillies 3 games to 2. This series has been called one of the most exciting in history. The Phillies went on to win the World Series in 6 games.
Similarity to Dazed and Confused (1993): Both films feature a scene in which four characters marvel over a broken paddle in very similar ways. In Dazed and Confused, Pink points out that Benny's shop class paddle has a hairline fraction from an off screen freshman hazing. In Everybody Wants Some!!, Jake points out the split handle of McReynolds' ping pong paddle after he throws it in a rage.
During batting practice McReynolds calls the pitcher Jay Niles "Meat", which maybe a reference to the baseball movie Bull Durham. In Bull Durham, Kevin Costner's character calls Tim Robbins character "Meat". Robbins character was a pitcher in that movie.
The trivia item below may give away important plot points.
Willoughby has almost every episode of The Twilight Zone (1959) recorded on Betamax. The Twilight Zone: A Stop at Willoughby (1960) concerns a character named Gart Williams (James Daly) who longs for a more idyllic past and takes drastic steps to recapture it. Similarly, in the film, it is revealed that Willoughby took drastic steps, falsifying his transcripts and lying about his age, so he could continue to play collegiate baseball and cling to an idyllic past.