Going off the original cast recording:
Two By Two = Little Shop of Horrors (starting at 3:44)
You and Me (But Mostly Me) = Defying Gravity (underscoring starting at :30), and the final "Me" is a nod to the end of The Wizard and I
All American Prophet = The Music Man (Rock Island/Trouble) (starting at 2:54)
Sal Tlay Ka Siti = a nod to Disney in general
Man Up (featured in the Entr'acte) = underscore to "I Hope I Get It" from A Chorus Line
Just my 2 cents