Karan (Ritesh Deshmukh) sings "Jaadoo Teri Nazar" from Darr (1993) while in shower. Jaadoo Teri Nazar was sung by Shahrukh khan in Darr, playback singer Udit Narayan.
Referenced in a dialogue by Karan Johar in his cameo when he tells Zaffar Khan how every newcomer gets his big break in Bollywood like Mr. Shahrukh Khan did in Darr & Baazigar when he was a "nobody"
Aamir Khan's character calls Juhi Chawla as J-j-j-j-juhi, thus mimicking the "K-k-k-k-kiran" style of Shahrukh Khan's character from Darr in which the actress Juhi Chawla played Kiran