In this season, an artist who returned after competing in a previous season and joining a coach's team (like Prinnie Stevens in this episode) was billed as an "All Star". Graphics bearing these words would appear on the stage during their auditions, but they would not be visible to the coaches until their chairs turned around, whether it was after the coach pressed their button or at the end of the audition.
In addition to the All Stars, the series consisted of several other contestants who had made previous appearances on other talent quest TV series including The Voice Kids (2014), The X Factor (2005), Young Talent Time (2012), Australia's Got Talent (2007), Australian Idol (2003) and Young Talent Time (1971), as well as some contestants who had appeared in previous seasons but failed to turn a chair.