Or maybe someone had noticed it months earlier, but this was simply the first instance of someone bringing it up to Seth Rogen on Twitter.
Plus, Fred Flarsky doesn’t mention Akira at all in Long Shot, so it’s not like we should have been on the lookout for a display of his fandom.
I can understand no one noticing the Akira tattoo when Long Shot was playing in theaters, but given how one can pause a movie while watching at home to their heart’s content, I’m surprised it didn’t catch anyone’s eye until now.