Throughout the album the band experiments with many combinations of genres, including hip hop, rock, Latin, punk, dub, acid jazz, and reggae. The beginning of the song "M1 A1" features a successive sound clip from the movie Day of the Dead. The song "Dracula" features sound clips from Merrie Melodies'Transylvania 6-5000. The song "Slow Country" features a sample from The Specials' 1981 single "Ghost Town". A sampled loop from "In the Hall of the Mountain Queen" by Raymond Scott is repeated throughout the song "Man Research (Clapper)". The song's title is a nod to Raymond Scott's Manhattan Research.
It was recently[when?] revealed that the track "Starshine" has an alternative version, which features Luton-based rap group Phi Life Cypher. This version is not available on any releases, but it is available on the Phi Life Cypher SoundCloud channel and also on the video-sharing website YouTube.
All editions of the Gorillaz album feature an enhanced section that included screen savers, wallpaper and an autoplay, featuring a short movie which opens the user's Internet browser to a special section of the Gorillaz website, which gives the user full access to Murdoc's Winnebago.
In 2004, the album was packaged with 2002's Laika Come Home in a limited edition box set as part of EMI's "2CD Originals" collection. Other songs saw a release such as the reggae-dub song: "Dub Dumb" which features British-Jamaican artist Sweetie Irie; it is available on the PlayStation 2 game MTV Music Generator 2 rather than on G Sides or the album itself. Other tracks include "Gor Beaten", which was another track that didn't make the album; however, elements of the track's instrumental were once available on one of the Gorillaz member's computers in Kong Studios.
"Tomorrow Comes Today" was released as an EP before the album was released. A video for the song was also released.
"Clint Eastwood" was the first single from the album, debuting on 4 March 2001. The single peaked at number four on the UK Singles Chart, number 57 on the Billboard Hot 100 and number three on the Billboard Hot Modern Rock Tracks chart.
"19-2000" was the second single from the album, released in June 2001. The single peaked at number six on the UK Singles Chart and number 23 on the Billboard Hot Modern Rock Tracks.
"Rock the House" was the third single from the album, released in October 2001. The single peaked at number 18 on the UK Singles Chart.
"Tomorrow Comes Today" was the fourth and final single from the album, released almost a year after the album, in February 2002. It peaked at number 33 on the UK Singles Chart.
"5/4" was repeatedly considered for a single but was edged out by "19-2000" and "Rock the House". A video was considered for this song, but never got past the storyboarding stage.