The Importance of Remembering Names

The movie could have been like 10 or 15 minutes shorter If they just cut down the amount of people just running around wailing What's his name? I'm struggling to find a thematic reason for why it's important. When they find out that their body swapping how it like jumps into a musical punk music montage that was so bad. It's really I'm really Upset that I that they translated the music to to English because I haven't heard the original Japanese songs but like listening to it through made me enjoy it more.