"Slip It In" blends the aggressive, fast-paced punk that fans of Black Flag's early work loved with more complex and melodic elements. Tracks like "Swamp" and "You Set the World on Fire" showcase the band's ability to merge short, sharp bursts of energy with more experimental soundscapes. Lyrically, the album tackles themes of disillusionment, societal critique, and personal struggle, consistent with the band's punk ethos.