Nickelodeon All-Star Brawl contains multiple unused announcer lines including:

• Several character names (including characters from Rocko's Modern Life and The Adventures of Jimmy Neutron: Boy Genius, which were not represented in the base game)
• Item announcement calls which did not end up being used (despite the narrator having used voice clips relating to the items)
• All of the stage names (notably including alternate names for the Slime Time stage in the form of "Double Dare", "Double Dare Stage", and "Double Dare Extreme")
• Perhaps most interestingly, lines relating to a shop feature where the player could buy outfits, characters, moves, and stages. The reveal press release for All-Star Brawl references the ability to "unlock advanced moves", which may be referring to this scrapped feature.