May, providing a ceremonious backdrop to the concert. Footage of the stage crew celebrating his birthday can be seen on the bonus second disc. Although the recording was edited and cut between songs, the songs themselves are rarely edited; mistakes made by the band members are left in the DVD. During the bridge of "Elevation", Bono skips a few words when he is forced to clear his throat. Along with the extra lights used to facilitate filming, Willie Williams and his crew used the United Center's LCD rings that circle the seating area (which generally display scores or advertisements during sporting events) to display additional patterns that correlated with the stage lighting, as well as static during "Zoo Station." Williams discusses this in his online diary on U2's website. A clip of "Original of the Species" was used in commercials for Apple's first video capable iPods. Furthermore, the icon for "Artists" in the Music App of Apple's iPhone and iPod Touch is a silhouette of Bono singing "Original of the Species" during this concert. "Party Girl" was performed both nights, on 9 May with Bono and a fan, and the second night with the full band and the same fan. However, neither was included on the DVD. A brief clip of the band rehearsing the song at the 10 May soundcheck can be seen on the documentary found on the second disc. All other songs performed between the two nights were included on the DVD, in the correct order. Audio was recorded for playback in the Dolby Digital 5.1, DTS 5.1, and PCM Stereo formats. Before the band takes the stage, a snippet of Arcade Fire's song "Wake Up" is played. Critical reception Vertigo 2005 received generally favourable reviews. David Barton of The Sacramento Bee called the video "an essential document of the essential rock band of our time" that makes "the home viewing experience nearly as immediate as the live one". He praised Bono's stage presence and the band's maturity in their performances, and the set list for balancing hits with deep tracks. Barton criticised Hamilton's direction and quick cuts, saying that he "doesn't trust his performers enough to be visually interesting" and that the result was "condescending and irritating". Bernard Zuel of The Sydney Morning Herald said the band was "Still the best at this level", calling them "expansive and intimate" in their performance. The review concluded, "Creatively,