I am not sure if there has been a thread already regarding this but I would like to point out that the outline headlines change in the middle of Player Core. It's not a big issue, just something that should be fixed in any reprints.
Up to page 27, the outline reads Leveling Up, Setting, Deities. Then from page 29, it says Leveling up, Golarion and the inner sea, Religion.
https://imgur.com/a/c5uHpv3