1. Carpool Karaoke might be about the famous musician's songs, but Spears referenced another famous group's music: Ace of Base. While discussing her desire for more kids, B. Spears casually sings, "All that she wants is another baby," a famous lyric from Ace of Base's hit song "All That She Wants."
2. Corden and Spears more than just coordinate outfits during their "Hit Me Baby One More Time" duet. Throughout the majority of the video both Britney and Corden wear all-black ensembles.