The ending theme is the ending song for The Amazing World of Gumball. In the US, it is usually only audible on demand or on Hulu, otherwise the credits play on the bottom-left corner at the end of each episode. In the UK, the credits are never played on TV or (more recently) on demand.
- The Japanese dub has a completely different ending theme entitled "Yes / No Continue?" The song uses video game sound effects, and has an upbeat J-pop song to accompany it.
- However, some Cartoon Network Japan airings of episodes contain the original ending theme with the Japanese credits at the end.
- In seasons 1 through 3, the cast listing shows "Mom" and "Dad" instead of "Nicole" and "Richard," respectively. James Lamont joked that Gumball was responsible for the end credits. Starting in season 4, the cast listing replaces "Mom" and "Dad" with "Nicole" and "Richard."
- In the Canadian end credits, it is spelled "Mum" instead of "Mom."
- In "The DVD," the ending theme was instead replaced by Darwin singing the theme song from Alligators on a Train.
- "In "The Car," a slowed down variant is used when Gumball and Darwin clean up Mr. Robinson's floor.
- In "The Fan," Sarah can be heard singing the song at the end of the episode, thus breaking the fourth wall.
- As heard in "The Law," Elmore ice-cream trucks play the theme.
- In "The Disaster" and "The Rerun," the Wattersons sing "It's A Lovely Morning" to the tune of the theme.
- Additionally, in "The Disaster," the ending theme plays in the Void while the credits scroll in reverse.
- A slower version plays in "The Shippening" when Sarah finds the notebook.
- In "The Understanding," Principal Brown plays the song before his PA announcements.
- In "The Inquisition," a slowed down version plays over the title and at the end.
- The rhythm of the song is a recurring motif used throughout the music of the show.