In 9, if you pause before 8 walks in front of one of the statue bases, whilst outside the library, you'll be able to read the sign in the background: "Cheer bad and cheer good and shadows which we cast". Not sure whether it means anything, but it sounds cool.
In An American Tail: Fievel Goes West near the end of "Dreams to Dream" as Cat R. Waul is carrying Tanya away, there is a crudely drawn penis and testicles next to Tanya's open mouth for one frame.
In Astérix Conquers America when a beggar pretending to be legless stands up and runs, his genitalia is exposed for a couple of frames.
In Atlantis: The Lost Empire, as the window of the submarine descends, an extra waving at the camera is visible for a few frames.
In Batman & Mr. Freeze: SubZero when Mr. Freeze shoots his ice gun at Barbera when she's hiding in the air vent, as she kicks away the column of ice to get past it you get a split second shot of her panties.
During "Belle (Reprise)," watch carefully during the part right at the beginning where Belle sings "Madame Gaston, his little wife." She kicks a barrel, causing two buckets atop it and corn to go flying. The goats and chickens that are there with her all reel back in alarm, their eyes going wide and their mouths agape.
On the left side of that background, there is a wanted poster for Flynn Rider as well. And there are likely several in Hiro and Tadashi's room with all the action figures and posters. A prominent one appears to be a large clock using either Gigantor or a Mazinger, though the arms seem to always be showing the same time throughout.
Hans makes another appearance, as the Statue, which Baymax tests his Rocket Fists on.
One of Fred's throw pillows features the face of Stitch, as does one of the framed photos in Hiro's house.
One of Stitch's cousins (Experiment 619/Splodyhead) appears on another pillow next to the Stitch pillow.
When the gang is talking in Fred's den, there are models of the Marvel villains Black Talon and Orka in the background.
The Canadian animated short The Big Snit is packed with visual gags that are only on screen for a few frames, especially in scenes of panic resulting from the announcement that nuclear war has broken out.
The scenes of panic in the streets include a motorcycle driving over the cars on the road, a car seemingly being driven by a pack of dogs, a man in a turtle-drawn chariot, a telephone box being pushed along in front of a car, a man in just the back half of a car holding onto the fender of the car in front of him, a car somehow driving while upside-down, Noah's Ark (on the road, no less), a man sleeping peacefully in his bed somehow keeping pace with the cars around him, a steam engine, and a man on a hostess trolley.
A high altitude shot of nuclear missiles flying all over the world includes a shot of Santa Claus and his sleigh and reindeer - complete with the sound of jingle bells.
When the bombs hit, sending the protagonist couple (and their cat and parrot) to heaven immediately, a collection of Scrabble tiles reading "HOTEL 10 KM" floats on screen for a few frames.
Characters from El Tigre appear in a crowd shot in the 2D animated prologue.
At the very end of the movie, when Xibalba and La Muerte kiss, they form the Sacred Heart.
Brother Bear 2: While Kenai escapes with Koda from the villagers, Atka hurls his spear at the bears, grazing Kenai's shoulder. At that moment, blood actually sprays from the wound, averting Bloodless Carnage as it usually is in Disney sequels. The blood shows up again when Kenai tries crawling through two rocks to escape (where it smears the top rock), and again when Nita cleans his wound after he's shoved off a cliff.
When Cinderella gains her magic ballroom gown from the Fairy Godmother for the very first time, if you pause at the right moment when she is spinning in her said gown, for a split-second you can actually see her in the very pose they used as stock clip-art for her merchandise.
The Rope Bridge sequence in The Emperor's New Groove features a moment when some boards fall into the chasm; if you slow it down enough, you can see they are stylized letters spelling out "D-A-M-N".
When he and Anna announce their engagement to Elsa, he briefly sports an "Oh, Crap!" Smile after Anna declares that she wants to invite his entire family to the wedding, a sign that he's estranged with them and actually wanted to rub his achievements in their faces. When Elsa refuses, Hans looks offended, indicating he may have to tweak his scheme a bit.
During the ice castle siege, there's a glimpse of him looking up at the chandelier before grabbing the crossbow from the Duke's thug. It seems that hitting the chandelier is intentional on his part: he's trying to give the impression he wanted to save Elsa while actually killing her in the process.
In hindsight, one should closely note that his eyebrows don't budge an inch when he smiles, showing that he's faking it. There are a few times where his expressions are real, like when he's dangling from the stairway after Marshmallow tries taking him into the abyss. It also ties into the drastic changes in personality he demonstrates, such as suddenly perking up when Anna heads off to search for Elsa despite initially pleading with her not to go out alone.
Frozen Fever: When Elsa sneezes into a flugelhorn and the view cuts to a map of Arendelle as a giant snowball flies all the way to the Southern Isles, in the upper right are the Roman numerals "MDCCCXL"; this translates to "1840", which gives a hint to the franchise's timeline.
In the Powerline concert in A Goofy Movie, Mickey Mouse can be spotted, very briefly, cheering in the audience.
In Home (2015), after Oh modifies Tip's car, you can see a upside-down calculator inside the workings of the car that has "LOL BOOBIES" (5318008 101) on its screen for a couple seconds.
When Mrs Tweedy slams her fist down to shut Mr Tweedy up, their wedding photo is glimpsed in the background. It can also be seen behind her desk.
When Mr Tweedy briefly catches the chickens all doing press-ups in unison, Bunty is doing hers one-handed.
Look very closely during the climax. When Mrs Tweedy almost beheads Ginger while hanging from the Christmas lights, there is a very easy to miss frame where you can see Ginger ducking her head away and the axe severing the Christmas lights.
On the tree behind Bunty and Babs at the end, there is a heart carved into the trunk with two names inside it, which are partly indistinguishable but probably meant to say "Ginger and Rocky".
In the first, there are several bonuses that count as foreshadowing examples, and might be overlooked until another character's story gets told.
If you look carefully during Red's mine cart ride with Japeth, when they pop out of the tunnel, you see the drop they go down with a POV shot. Another driverless cart can be seen scooting by on the track Red's cart goes under. You might make out two individuals on it. When you freeze it, you will notice the Wolf and Twitchy. In turn, when the Wolf gets to this point in the story, (just after he says "Now this is a shortcut!") they pass by another track that has a steep drop down the hillside that goes under their cart's track, and you hear a scream as a cart drops in the background. Freeze the image at the moment of the scream, and you can see Red dropping in her mine cart.
When Red is looking at the map of the mine tunnels in Japeth's shack during "Be Prepared," if you freeze it, you'll see places with such punny names like Puckett Grove, Sam Hill, Kanbar Kanyon, the Blue Yonder, Murphy's Low, Boulderdash, and something that looks like it says "Old Man's Cave" (partially obscured by Red's head).
When Red is in the treehouse and reading a travel magazine, if you freeze at the right time, you'll see that she's looking at a cartoon of what appears to be a rhino and zebra having tea.
When Red falls from the cable car, right before she slips, Boingo's grab is far more at her basket than her. Also, when Red is plummeting, you can see him looking down at her - but his expression is one of anger rather than one of concern.
Red's confrontation with the Wolf has her use Mace spray on him. If you freeze the image at the moment she pulls it out, either in her story or in the Wolf's story, it clearly says "Wolf Away Spray". Which leads to the revelation that Red is Crazy-Prepared.
Twitchy only makes a three second cameo in Red's story, during the bit where a flashbulb in his mouth goes off.
When Boingo is Storyboarding the Apocalypse to Red, you can see that his proposed "Boingoland" will extend into Smallville, and also has an airport, an amusement park, and a lot of other intersting things relating to him.
In the second, the recipe for the MacGuffin is briefly on screen. If you freeze the image, you can see amusing fantasy-story entries like Sleeping Beauty's morning coffee, but right at the bottom is Soylent Green, crossed out with "People!" written beside it.
One can see the attendees of Bob and Helen's wedding in the church pews at the beginning of the movie Edna, Rick Dicker, Gazerbeam, Dynaguy, Stratogale, and Thunderhead.
Dash can be seen moving on the video tape if one keeps a keen eye.
Bob's newspaper (where he learns about Gazerbeam's disappearance) has a number of worrisome headlines, such as "Crime Rate At All Time High."
Huph plays with a memo on his desk while he lectures Bob about how unhappy he is. With the right timing, you can freeze the Blu-Ray version and read it to learn that Huph is now mandating that all employees pay (i.e. self-expense) for all the office supplies they use during their workday. In addition, their parking spots will now be metered hourly and the cost of their telephone and electricity will now be deducted from their paycheck. He thanks them for their sacrifice which will ensure another year of record profits for Insuricare.
When Bob is a lecture from Rick at the hospital after Huph gets Punched Across the Room, you can briefly see the mugging victim he couldn't save being wheeled in on a gurney in front of them.
During the newspaper montage covering supers being held accountable for their damages, one of the newspapers they show is the Municiberg Tribune which has three articles on the front page legible enough to actually read: "X-ray vison peeping tom? Super Snooper sees freedom"; "Citizen arrest nabs do-gooder"; and "Storm Pounds Coast".
Justice League: Crisis on Two Earths: A computer display briefly shows an assortment of identifiable counterparts of various superheroes as supervillain "Made Men" working for the Syndicate.
In Kung Fu Panda, in the "you are free to eat" scene, if you pause just as Shifu snatches away the first dumpling Po tries to eat, you can see he's practically making a Troll Face.
In Kung Fu Panda 2, during the scene where the heroes are captured and Po puts Mantis inside a cage, you can scroll along frame-by-frame and see Po swapping out the real Mantis with his wooden action figure.
Kung Fu Panda 3 has several extremely brief shots of Tai Lung, the first film's antagonist, as one of the jade amulets on Kai's belt.
In Lilo & Stitch, Stitch hits Jumba with the VW Beetle and knocks him into Nani's bed, over which hangs a poster of surfing legend Duke Kahanamoku. When Stitch pins Jumba with the Beetle, Duke briefly has a shocked expression on his face, visible for only a fraction of a second.
When Moana sets off on her journey, and is loading up the hold, you can see the Arms and Nose of Olaf, from Frozen!
In Monsters, Inc., among Mike's paperwork is a scare report for an 8-year-old Hispanic kid named Albert Lozano who is described as "Energetic, imaginative, artistic, giggler, and potty mouth. Most likely to become an artist." and is listed as a bedwetter, has a fear of snakes, and recently got a new dog, plus a detailed description of his room and the logistics of his house with a floor plan clipped on. It shows up once early in the film and then much later when Sulley is escaping Randall's lair, only without the floor plan.
Sunny's house is full of references to Friendship is Magic, and numerous pictures and diagrams of the older show's items, locations and characters can be seen tucked in the background of pans of her house.
During Sprout's song, a pony is reading a newspaper with an article about the earth pony who floated away during the CanterLogic demonstration.
During the production of The Rescuers, one of the animators decided to pull off a prank, and inserted an image from Playboy into a few of the frames. Normal viewing could not reveal anything, but a careful freeze frame did. When it was spotted by Disney, the image was edited, and all subsequent VHS and DVD editions were Playboy-free.
Bernard's current cover pose for The Rescuers can be seen for a few frames during the "Tomorrow Is Another Day" montage to Devil's Bayou.
In Rock-A-Doodle, when The Grand Duke of Owls changes his nephew Hunch back into his regular form after changing him into a green mutant bird when he reports back to him about Edmund and the others having supposedly drowned, he for a fraction of a second takes on a form that looks like Stanley the Troll from A Troll in Central Park, which wouldnt be released until three years later.
When Terrence and Phillip are getting shocked on their chairs, you can see that Kyle has pissed himself.
During the "Blame Canada" number, Sheila shows her group a newspaper headline about Terrence and Phillip appearing on Late Night with Conan O'Brien later that night. Other headlines on the front page read "Poop Declared Edible" and "Christians Agree: Guns Are Nifty".
A couple of the flags outside the United Nations building are a rainbow pride flag and a Jolly Roger.
One of the South Park men going to war is Jesus, complete with halo over his helmet.
One such bonus in Spider-Man: Into the Spider-Verse contains a subtle hint about the film's plot that many won't catch on the first viewing: during Spider-Man's narrated origin story in the beginning of the film, as he's pulling his mask on, one can see that Peter Parker's hair is blonde instead of brown like the alternate-universe counterpart that appears later on.
Storks: It goes by quick, but when Pigeon Toady is showing off his 'girlfriend' (which is a picture of a live-action Canada goose) you can see that he actually pulled the picture up in a Google image search.
The Thief and the Cobbler has a scene where the eponymous Thief is shot out of a cannon. If one freeze-frames the movie at the scene where the Thief is facing the camera, the flies perpetually circling his head turn out to be minature Thieves with wings, a testament to the animators' talent and determination.
Toy Story 2 did this with the scene where Buzz is karate-chopping through the bush — look real closely at the last twig he chops: there is a tiny caterpillar crawling across it. This instance was later referenced in the bloopers with Flik and Heimlich appearing on it.
Also, when Hamm is flipping the channels looking for the Al's Toy Barn commercial, the images that flash by are from older Pixar shorts and commercials.
Not to mention the Pixar Star Ball popping up everywhere...
Toy Story 3 had a moment where if you paid close attention it was possible to see that one of the two garbage men is Sid from the first movie.
Many, many jokes and sight-gags in the background, especially signage containing brand names, or Duke Weaselton's display of pirated DVDs.
On the Wrangled DVD cover, Rapunzel (who in this universe is a horse) is holding her hair in the same pose as the cover of Tangled. However, if you look closely, you'll see that 1) the hair she's holding is actually her tail, and 2) there's an extra length of hair strewn across the grass compared to the Tangled cover. That's the end of her mane.
As Judy comes out of the train station after first arriving at Zootopia, several Junior Ranger Scouts (of the sort Nick wanted to join) can be seen to her left.
The Pig getting her picture taken at the DMV is also the prison guard seen in the end credits.
Near Bellwether's desk is a sticky note that has Doug's phone number on it, tying her to him.
When Nick gives Judy his filled-out application form, one question asks if he's been arrested or charged in the past. You can see he initially checked "Yes", but then scribbled it out and boldly checks "No" instead. This is accurate, as he indicated earlier he's never been arrested before and he realized Judy's tax evasion arrest didn't count — at no time was he read his rights or placed in police custody, so he was never officially under arrest.
The rabbit mannequin used in the Natural History Museum is a saber-toothed Jackalope.
During the Little Rodentia chase scene, there is an advertisement for Thigmo taxi services. Thigmotaxis is a behavior in mice where they cling to solid objects, which one of the mice is understandably demonstrating when Weaselton starts knocking over houses.
When Judy goes back to Bunnyburrow after quitting the force, you can see a copy of the Bunnyburrow Beacon with an assortment of small town news articles, including one on the Population: X, and Counting sign getting a new coat of paint, an article about the annual Carrot Days Festival (and an advertisement for same), and Otto Hopps (Judy's grandfather, who's also seen in a few deleted scenes) celebrating his 101st birthday.
Towards the end of the movie, when the three officers are assigned to undercover, Snarlov, the polar bear officer, simply puts on a baseball cap as his "disguise". It's also the same baseball cap worn by Judy's father, Stu, throughout the film: a light green cap with a dark green front and a carrot label on the front.