I notice a lot of things are pronounced differently than they would in regular spoken speech. It could just be my ears. However, here are a few examples in BTS's DNA.
1:49 https://youtu.be/t9LC-YMxznE?t=109 As for "소스라치게", the "치게" sounds like "chege" when sung rather than "chige" as I'd expect for spoken language.
2:35 https://youtu.be/t9LC-YMxznE?t=155 As for "우연이 아니니까", the "아" sounds like "ya" when sung rather than "a" as I'd expect for spoken language.