I'm not too sure about the razor joke. But Woozi did mention Dino's electric razor/shaver in a previous Going Seventeen video.
Reference: Going Seventeen 2020: Insomnia Zero #1
#SEVENTEEN @pledis_17
Reference: Going Seventeen 2020: Insomnia Zero #1
#SEVENTEEN @pledis_17
When Seungkwan was saying his closing ment as Wonwoo, one of the members sang, "Lies ~ " That was in reference to Wonwoo's solo Ideal Cut song <LIES>.
#SEVENTEEN @pledis_17
#SEVENTEEN @pledis_17
One of Coups' more well-known Korean nickname is ์นํ์ค (SeungHaengSeol). It stands for "Seungcheol's (considerate) gestures make my heart flutter". So when Mingyu (as Coups) gently brushed something off of Seungkwan's (as Wonwoo) face, everyone was saying, "SeungHaengSeol!"
When everyone was gaining up on Hoshi (as Seungkwan), he said that everyone was "twelving" him. In a past If video, Seungkwan explained that the number 12 sounds like ์๋น, which means to pick a fight with someone.
Reference: If - Seventeen's Battle of Burgers #1
@pledis_17
Reference: If - Seventeen's Battle of Burgers #1
@pledis_17