Keep going, keep going!
Maelstrom nods in the Frozen Ever After Queue/the waterfall is technically a good remnant of the opening that used to be there... As well as the boats themselves.
You can look up pictures of the abandoned Food Rocks stage that sat for a few years before turning into restrooms.
Uh-Oha animatronic is in a tiki-themed bar at one of the resorts... Never been there myself, though.
Figment, OG abominable snowman, and the octopus from CBJ can be found in the queue line at mission breakout at california adventure
A few animatronics in Spaceship Earth are the same molds of presidents and carousel of progress characters.
Grandma from Carousel of Progress is sitting in a rocking chair in Haunted Mansion.
The pre-show video for the incredicoaster at california adventure pays tribute to california screamin via a joke. Same to classic epcot in the pre-show bits for guardians at epcot.
"Dean Finder" is a name on one of the doors in the Imagination ride... Reference to Dreamfinder.
The tree outside the Winnie the Pooh attraction was originally used in Pooh's Playful Spot, a playground at Magic Kingdom.
One everyone knows, Splash Mountain AAs recycled from America Sings (Disneyland)
The vultures from Scary Adventures are now on Seven Dwarfs Mine Train as well.
Retired-- Skippy was used from Alien Encounter over into Stitch's Great Escape.
The floats in festival of the lion king were originally used for a lion king parade at Disneyland.
The OG Captain Rex is in the Star Tours queue "malfunctioning" shouting some dialogue from the original ride. He is also a DJ now in Galaxy's Edge.
DISCLAIMER-- oogie boogie animatronic was ORIGINALLY big al but was re-built from scratch later. Just found this out.
At Disneyland, Pooh's honey pot suspended from the ceiling used to be Teddi Beara's swing.