38:20 'lifetimes...' one life. Just VERY prolonged (50k years). She has been killed twice. The first time it took her twenty years to heal and wake up. The second time her body was healed for her. So,.it was a lot quicker. Less than a year.
23:19 'twins...' Seele and Dark Seele are two souls occupying one body. Dark Seele (who could be better described as antipathic rather than evil) is the consciousness of Seele's stigma (the red mark on her chest) born from Seele's need for protection and her own feelings of defenselessness. It's seems reminiscent of MPD (multiple personality disorder) where an alter is produced to offset the hosts perceived shortcomings.
49:01 "skipped this one..." This song isn't from a cut scene. It's VERY old it's called Lyin' (see you in the next world) it's from GGZ (houkia goukian 2) and it gets played in HI3 during the 'sad' parts. Tha song has no lyrics. The vocals are just syllables that sound sad. I would recommend watching the GGZ cutscene for this song.
0:47 'online...' I'm pretty sure these concerts are done for hoyoverse to showcase their AR/XR technologies. Not that I'm complaining. They are great concerts!