Warning was also Green Day's first album since Kerplunk (1991) that was not produced by Rob Cavallo, although he did have a hand in its production and was credited as executive producer.
Warning é tamén o primeiro disco de Green Day dende Kerplunk (1992) que non foi producido por Rob Cavallo, aínda que botou unha man na súa produción e foi acreditado como produtor executivo.