There's a little detail in the manga that could raise a few questions about canon. In chapter 74, Liz mentioned a time where she got to see a jazz musician perform live one time. It was then shown in an illustration that the musician was Miles Davis- who died in 1991! Raises questions about Liz's age and/or the decade the story was set in.
Liz: “Hey, it’s not like I’m old or anything...The manga started in 2003, so let’s pretend I was a little kid dragged by my mom to a performance, and that most of our story in the manga took place in the 2000s.”
Soul: “Or we’re not quite in everyone’s timeline, readers are too hung up on a story about the Grim Reaper and weapon-people fitting into their ideas about their own world, and Lord Death picked and chose when he picked up people at times different than when they died--”
Tsubaki: “Isn’t it in bad taste to try to look at the lives of real people within our tale?”
Jacqueline: “NOT alluded to Kennedy’s affairs--I’m sure we’ll be fine.”
Shinra: “Be thankful you’re in the same time period as the ‘real world’--I’m stuck in a post-apocalyptic fire-land, so aside from a random Star Wars reference now and then, we lost most of our pop culture.”
Black Star: “...Who the hell are you?”
