His standout performance were in these ines in these songs:

Teri Meri Prem Kahaani

Himesh's lines, SAARE (nice twist) at 3:00, AAAAAA (prolonged heartfelt alaap) from 3:02 to 3:04

Aashiq Banaya Aapne

He sings it in slow tempo. His lines, BANAAYA-AAA (Historic catchy heartfelt twists, wins over listener) from 3:29 to 3:31, 3:32 to 3:34, 3:36 to 3:37

He also gives a new twist to the lines TERE BIN SUNI HAI RAAHEIN, TERE BIN PYAASI HAI NIGHAEIN....which could have been included in an unplugged version in OST.

Naam Hai Teri

His lines, PE-EEEE (prolonged catchy) DEEWARON PEEE (off-da-hook catchy) from 3:57 to 4:04

Tere Naam

Heartfelt singing.

His line, TERE (awaaz mein kashish) from 4:44 to 4:45, GUZAARA (heartfelt singing) from 4:57 to 4:58

Main Jahaan Rahu

Nice rhythm orchestra joins from 5:39 onwards gets viewer into zone.

His line, HAI-AAI (awaaz mein kashish) from 5:57 to 5:59

Hookah Bar

He sings it in lower octave as compared to OST. It sounds catchy as hell.

His lines, TERE PYAAR KA NASHA KABHI AAR KABHI PAAR (Historic catchy middle to lower octave singing wins over the listener) from 6:18 to 6:21, PYAA-AAR (Historic catchy middle octave, wins over listener) from 6:29 to 6:30, BAR-AAR (Historic catchy middle octave, wins over listener) from 6:31 to 6:32

Dard Dilon Ke

His lines, DARD DILON KE KAM HO JAATE (sung in lower octave vocals) from 9:31 to 9:36

Prem Ratan Dhan Payo

It sounds much catchier in his voice, also because the scale he is singing the song is higher as compared to the OST.

His lines, SAIYAN TU KAMAAL KA BAATEIN BHI KAMAAL KI, LAGAA RANG JOH TERA HUI ME KAMAAL HI (off-da-hook catchy) from 10:03 to 10:21, also the rhythm that joins in from 10:08 onwards. gets listener into the zone.

Conclusion

It was a Rwakin, energetic and heartfelt performance, and overall standout performance was in songs Hookah Bar (wins over listener), Aashiq Banaya Aapne (wins over listener) and Prem Ratan Dhan Payo.