Kirsten Spruch of Billboard described the track's genre as "quirky adjacent" folk.[6] According to Musicnotes.com, "Party Favor" is played in the key of C major, while Eilish's vocals span a range of A3 to A4.[7] It is the only song on the EP that includes Eilish playing the ukulele.[6] In the lyrics, the song starts with a phone ringing and someone saying, "Hey, leave a message."[8] It then slowly formats to a voicemail with Eilish explaining that she is leaving a boy who has become too possessive over her, and trying everything to get him out of her life: "Look, now I know, we coulda done it better/But we can't change the weather/When the weather's come and gone/Books don't make sense if you read 'em backwards/You'll single out the wrong words/Like you mishear all my songs."[8] Eilish warns her lover that she is done. Halfway through the song, Eilish then reveals that she's dumping her boyfriend on his birthday: "You just want what you can't have/No way/I'll call the cops/If you don't stop, I'll call your dad."[8][3] Sam Moore of NME described the genre of Eilish's cover of "Hotline Bling" as "delicate indie pop" compared to the original version.[2]
Reception
Thomas Smith from NME said the song was "a far cry from her now-relentless and brooding productions, but still irresistibly catchy."[9]Insider's Claudia Willen called it "a creative and brutal portrayal of just how ruthless breakups can be," though stated that "the song doesn't beg to be listened to on loop as some of Eilish's other breakup songs do, like 'Watch' and 'Bitches Broken Hearts'.[8] Spruch commented that "Party Favor" can "be easily overlooked when standing next to early hits 'Bellyache' and 'Ocean Eyes'," but that it "still has a whole lot of that Eilish persona."[6] Commercially, the track has been certified gold in the United States and Canada by the Recording Industry Association of America (RIAA) and Music Canada (MC), respectively.[10][11]
Live performances
In November 2017, Eilish and Finneas performed an acoustic version of "Party Favor" for Mahogany.[12] The song was also performed live during Eilish's North American 1 by 1 tour in 2018.[13] The track was included on the setlist of her When We All Fall Asleep Tour (2019).[14]