I totally saw that! I also saw the plate of candies in Frozen that were an "easter egg" from somewhere. It was next to Anna during "For The First Time In Forever".
You're probably talking about the candy from the Sugar Rush parts in Wreck-It Ralph. But honestly, I really didn't see it both times I watched Frozen; mybe I should watch both back to back :/
Dim, Flik, and Hemilcih in Toy Story 2.(Dim and Flik are toys, and later Flik and Hemlich appear in the bloopers)
Heimlich can also be seen briefly in the actual movie, on a branch before Buzz chops it.
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The Three Caballeros: The soundtrack from
Fantasia appaears shortly before Panchito appears
The Rescuers: Madam Medusa's car is Cruella De Vil's car (early designs of the former actually look like the latter)
Lambert The Sheepish Lion: The stork is the same one as in
Dumbo
Alice In Wonderland: One of the judges during the trial scene looks like José Carioca; the fish that watch the walrus luring the oysters to the shore are the same ones as in
Pinocchio, albeit differently colored
The Great Mouse Detective: Bill the lizard from
Alice In Wonderland is one of Ratigan's henchman (now we know where Alice's sneeze sent him to
)M a Dumbo toy also appears in the same movie
101 Dalmatians: Several dogs from
Lady and The Tramp appear during the twilight bark scene
Oliver and Company: Roger (
101 Dalmatians) can be seen after the opening song, also Pongo and a couple of dogs from
Lady And The Tramp are seen during the
Why Should I Worry scene
Bambi's mother and Bambi himself can be seen during the
Someone's Waiting For You scene in
The Rescuers and the former can also be seen at the beginning of
Beauty And The Beast
Lilo & Stitch: Lilo owns a Dumbo toy and Nani has a
Mulan poster in her room and you can briefly see a restaurant called Wok Mulan during one scene
Monsters Inc.: The trailer Randall's banished to is the same one as in
A Bug's Life, a Nemo toy can also be seen hanging next to the door when Mike opens it; one of the background Randall used to practice his camouflage is Andy's bedroom wallpaper; Marlin is painted on a wall at Harryhausen's
Finding Nemo: When Nemo look around at the dentist's, you can see a Buzz Lightyear toy; a boy is reading a Mr Incredible comic; Luigi from
Cars appears at the end
The Incredibles: An early model of Doc Hudson can be seen in the background during the final fight against the Omnidroid and after the fight, you can see two old men talking - those are Frank Thomas and Ollie Johnston, the only ones of Walt Disney's Nine Old Men who were still alive during the film's production
Treasure Planet: Young Jim owns a Stitch plushie
A Bug's Life: The cookie boy the circus bugs use as transportation reads Casry Junior Cookies - after the train from
Dumbo
Ratatouille: Dug's shadow can be seen on a wall
The Princess And The Frog: Louis resembles Madam Mim (
The Sword In The Stone) during one scene; Genie's lamp appears early in the Dig A Little deeper number; one of the floats during the Mardi Gras parade look like King Triton; one of the shadows Dr Facilier summons to catch Naveen looks like Jack Skellington
Runaway Brain: Mickey plays a
Snow White And The Seven Dwarfs video game at the beginning of the short
Get A Horse!: Oswald briefly appears