The album had been sequenced and prepped for pressing when, in a last-minute conference with Journey's A&R man Michael Dillbeck, two songs were pulled from the original lineup, "Ask the Lonely" and "Only the Young". These two tracks were replaced with "Back Talk" and "Troubled Child". "Ask the Lonely" was utilized in the soundtrack for the film Two of a Kind. "Only the Young" would find its way into the Top Ten two years later, as part of the soundtrack of the movie Vision Quest.
The band recorded a song called "All That Really Matters," with keyboardist Jonathan Cain singing lead, during the album sessions. It didn't see release until the 1992 release of the "Time3" box set.
Frontiers was the band's highest-charting album in the United Kingdom, reaching No. 6 on the UK Albums Chart in 1983.
From an exclusive interview via E-Mail with Jim Welch by Scott Sullivan of the Journey WWW Page:
Frontiers was a subtle shift. Mouse and Kelley were not involved with that cover. My vision for Frontiers was based on "tunnels" and the relativity of time and motion. Light stays the same, but time bends. It was Einstein theories for artist interpretation. The alien in Frontiers wasn't really an alien at all, he was a connection to a higher level of listening to Journey.
^[...], Rock Hard (Hrsg.). [Red.: Michael Rensen. Mitarb.: Götz Kühnemund] (2005). Best of Rock & Metal die 500 stärksten Scheiben aller Zeiten. Königswinter: Heel. p. 65. ISBN3-89880-517-4.CS1 maint: numeric names: authors list (link)