Natural Villain studio recording

Since one of the first times I heard Natural Villain, I could have sworn I heard a 3 part harmony (minus Cadien) for the line “Start trying to treat me how I wanna be”. I eventually convinced myself that I was just hearing things because to my knowledge at the time there were 4 people in the band at the time. Then I stumbled across a couple videos, one being the Chic-A-Go-Go video for Fast Eddie and a video of Natural Villain live from Lazy Day Lounge where I saw there was a fifth member named Lucas. In the latter video, I saw there was a 3 part harmony going on for the part of the song I mentioned above. I was wondering if anybody knows if he was also included on the studio recording meaning there is a 3 part harmony on the track or if it was just the live version.

I love this song, and the vocal harmonies at the end is my favorite part of it, hence my very specific question lol. it sounds very beach boys-esque to me which i think is awesome :)