The film was based on the true events of the lives of former high school classmates (Bill Akers, Patrick Schultheis, Sean Raftis and Mike Konesky). As teenagers during the 1980s, they would entertain themselves by playing the schoolyard game during breaks at Gonzaga Preparatory School in Spokane, Washington.
In the television series, Mad Men, that made Jon Hamm a star a character asks in Season 3, Episode 5 if a man actually "threw a desk chair at the window only for it to bounce back and hit him". Jon Hamm does that very thing in this film.
Second film starring Jake Johnson to be inspired by a printed article. Johnson also starred in Safety Not Guaranteed (2012), which was inspired by a classifieds ad seeking someone to 'travel back in time'.
Marked as the first Warner Bros. film released after the parent company, Time Warner, had been acquired by AT&T and subsequently renamed Warner Media. Despite the acquisition, this is the last film in which the byline under the WB and New Line logos reads "A Time Warner Company".
Jeremy Renner mentally narrates his fighting moves when engaged in combat as well as anticipating the fighting moves of Jon Hamm, Ed Helms, Jake Johnson, and Hannibal Buress in a similar manner to his Marvel the Avengers/ Captain America Civil War co-star, Robert Downey Jr did in his fight scenes as Sherlock in Sherlock Holmes and Sherlock Holmes: Game of Shadows.
Jeremy Renner, Leslie Bibb and Hannibal Buress have starred in the Marvel Cinematic Universe, with Renner as Clint Barton/Hawkeye in various films, Bibb as a reporter in Iron Man (2008) and Iron Man 2 (2010), and Buress as Coach Wilson in Spiderman: Homecoming (2017).
This is the fourth movie that Ed Helms stars in that contains a song from Danzig, the other three being The Hangover trilogy. Just like in The Hangover part 3 (2013), we can hear the song "Mother" in Tag.
Jeremy Renner, Jake Johnson, Annabelle Wallis and Jon Hamm each starred opposite Tom Cruise in blockbuster films: Renner in Mission: Impossible - Ghost Protocol (2011) and Mission: Impossible - Rogue Nation (2015), and Johnson and Wallis in The Mummy (2017), and Hamm in the upcoming film Top Gun: Maverick (2020) (2020).
The trivia items below may give away important plot points.
Three times the movie hints at Ed Helms' character as being sick. 1) When he gets Jon Hamm, Hamm asks Helms if he has lost weight, 2) Helms tells Johnson's character he had been experimenting with medical marijuana, and 3) Fisher asks Helms if he is feeling alright at the reception.
When Hoagie (Ed Helms) is pinned by Jerry (Jeremy Renner) at the mall, Hoagie indicates to Jerry that he will not give up on trying to tag him until he dies. Unbeknownst to Jerry, Hoagie was quite serious when he said this - he believed this would be the last time they play tag before his death due to liver cancer.