Paper Jam actually contradicts itself:
First we have The most prominent example of this is the Royal Sticker Giant Pokey.
Not only does Paper Mario show no recognition of the item, but it also can’t exist from a timeline standpoint. The Royal Stickers came into existence because of Bowser screwing around with the Sticker Festival at the start of the game.
If Paper Jam took place before Sticker Star, then the Royal Stickers wouldn’t exist for the Pokey to use. If Paper Jam took place after Sticker Star, then the Royal Stickers would have already been restored
and the Pokey still wouldn’t have a way to get it. And we know Paper Jam can’t take place in the middle of Sticker Star because Kersti is nowhere to be seen and Bowser’s not corrupted by the Royal Sticker, which also happens right after he destroys the meteor
and isn’t uncorrupted until the very end of the game
A Paper Toad states that the Paper World lacks 3D blocks
Video due to media limit
despite every Paper Mario game having a 3D environment and 3D blocks
Paper Jam makes a point to say the paper characters are super light
Video due to media limit
despite that not being the case in the Paper Mario series
video due to media limit
Even then, it’s known that Mario world and characters canonically change how their bodies and physiology at random instances. they canonically know about Mario’s art style shifts, as shown with Sunshine
video due to media limit
and Odyssey
video due to media limit
showing that Mario and Bowser remember previous games in those art styles, Super Mario 64 in Odyssey
https://cdn.**********.com/attachments/834893505209827359/926661044024270899/FGhG_GPXMAU8TJz.png
and Super Mario Bros. 3 in Color Splash
video due to media limit
Other examples include: Yoshi being stated to be the same Yoshi seen in Yoshi’s Crafted World
https://nintendoeverything.com/yosh...rgarten-inspiration-flip-side-gimmick-more/3/
(also shown by the History Trailer for Woolly World
video due to media limit )
Not to mention yoshi story course in Mario Golf: World Tour
video due to media limit
and 8-Bit Mario constantly reappearing in different games across the Paper and 3D series
we also have this, along with the amous TTYD manual "Mario returns to paper form"
https://cdn.**********.com/attachments/1098323397798264973/1098324764965212200/UKScan.webp
"Before the brothers turned into paper"
and we have mario time traveling to his earlier adventures and meeting his past self who is pixalated)
https://cdn.**********.com/attachments/1098323397798264973/1098325147179569242/NESMarioScan1.webp
literally this
https://cdn.**********.com/attachments/1098323397798264973/1098325386477178992/Screenshot_20220316-091528.webp
Huey states in Color Splash that Mario's been fighting Bowser for 30 years
video due to media limit
Color Splash released during the Mario Series’ 31st year, whereas Mario’s canonically in his mid-20s and the original paper mario released in 2000
The CoroCoro manga (Super Mario-kun) treat Mario and Paper Mario as being the same person.
https://www.mariowiki.com/Super_Mario-kun For the Thousand Year Door’s folding curses, Mario gains the ability to flatten himself like paper.
https://images-wixmp-ed30a86b8c4ca8...0.59hQ3Ylthm-8HoOxMOLBZtGJFQxhSFwY3jQQjlFQGQk Paper Jam's Paper Mario is a completely different character
https://images-wixmp-ed30a86b8c4ca8...0.mFbvaTsqNCAS1K4DPs8UbQY3zzDMTBTOATJVAMOm--o While this isn’t canon, it gives a good idea of what other official media think of the idea
and btw, this isn't only a mario thing, other works such as mickey mouse, KH, Gumball, Ben 10, family guy and many others treats the artstyle changes as canon
And mind you with the way paper mario calls back the other games and vice versa, at worst we can argue they're parallel universes that share the events
Oh and also Bowser’s Castle has multiple different portraits of 3D Bowser which appear throughout Bowser's Castle in Origami King, yet no portraits of his paper appearance
video due to media limit