I'm currently playing Yakuza Kiwami (Remakes of Yakuza 1 and 2 but made after the sequels) and a lot of the side content in the game directly references events in Yakuza 0, such as the weird cult, the pocket racer circuit, as well as events that happen in the sequels such as Majima's fellow Yakuza being in Jail. Granted, there's not much of this in the main story.
Last of Us remake didn't add any 2 story content I think although it did use a few of the mechanics.
The Spider-Man ps5 upgrade does have the same face Peter uses in Miles Morales although they were made around the same time so probably doesn't really count.
The FF7 remake features several characters from spin-off material like the movie, portable games etc. although it isn't as much a "remake" as a semi-reboot I think.
Some are wondering with the rumors about Red Dead Redemption I being remade if there should be references to Arthur Morgan to harmonize the two games better. Or Metal Gear Solid III Delta featuring Skull Face cleaning up after Big Boss or confirmation that "Zanzibar land" from II is the same area.
If Knights of The Old Republic gets a remake there's speculation it will probably stick to the new Disney canon's changes to Jedi/Sith mythology.