[1] Mark Beaumont of NME said that the song, as well as "LA Girlz", are "noble throwbacks to the quirky grunge of Weezer’s debut".

Bodkin also praises Rivers Cuomo's songwriting for the song, stating that he writes with "hope and feel-good vibes".

"[4] On March 31, 2016, "King of the World" was performed on The Tonight Show Starring Jimmy Fallon in celebration of the release of Weezer's 2016 album.

[5] The song was performed the following day on Good Morning America, where a photo was shot with the band and several Major League Baseball mascots.

[7] The video features a bearded man in a king's crown and cape, running along a boardwalk, causing havoc, whom eventually gets caught by a police officer, who arrests him.