When Wreck-It Ralph realizes he is in the Sugar Rush game he says, "This is the candy go-cart game over by the Wak-A-Mole." However, at the beginning of the movie, as the camera rolls away from the Fix-It Felix Jr. cabinet, the game next to Sugar Rush says Wak-A-Troll.
During the race sign up scene, when each racer is throwing their coin into the gold cup as the entry fee, the announcer says Snowanna Rainbeau, and you can see a blue haired pig-tailed character just behind Rancis Fluggerbutter. This character is Citrusella Flugpucker, the 6th listed racer on the board, but she is announced as Jubileena Bing-Bing, who is listed 13th on the board. Jubileena Bing-Bing is the red pig-tailed racer, not the blue.
When the Sugar Rush racers are throwing in their gold coins to enter the Random Roster Race, the announcer can be heard reading the name "Adorabeezle Winterpop" third, after Taffyta Muttonfudge, and "Crumbelina Di Caramello" fifth, after Gloyd Orangeboar. But the next time the roster board is shown, Crumbelina's name is printed on line 3, while Adorabeezle's name is on line 5. The board's order may be considered the correct one, as not only does the same order appear on it again as the race commences, but Crumbelina can be seen lined up right behind Taffyta just before they begin to toss their coins to the pot.
At the movie's end, when Vanellope glitches out of her princess clothes back to normal, the princess clothes crumple together on the ground. They vanish instantly after and are not present in any other shots.
Ralph says he gets a perfect view of the game Sugar Rush when he is lifted at the top of the building, as if he cannot see it from a lower position. However in a previous scene he can perfectly see the game from a balcony.
Kano is depicted as American in the conference room at the beginning, when he has been Australian since the first Mortal Kombat movie, where Trevor Goddard played him as Australian and the creators decided to change him.
When Vanellope crashes just before the finish line, the color pattern of her kart's six straw exhausts are different before and after the arrival of Felix and Ralph. The "after" color pattern is the correct pattern that matches the rest of the movie. The "before" color pattern seems to have the left and right exhausts swapped.
When Deanna begins to pull Felix onto the dance floor, she is wearing a shiny dress imprinted with leaves and flowers. When they take their places in the next shot, Deanna is suddenly in a plain pink dress, with no imprints. Then, although she remains on the dance floor for the entire shot, when Gene answers Felix in the very next shot, Deanna is suddenly with Gene by the door, and she's back in the dress with the shiny imprints for the rest of the scene.
After Ralph destroys the cake and it goes all over the place, we cut to a wide shot. In this shot, to Gene's right, there is a small amount of cake on the floor. In the following shot, the amount of cake has doubled.
Vanellope's Kart only has a strawberry on the front right wheel - the other three wheels are just cookies. When Vanellope crashes just before the finish line, the strawberry is on the front left wheel.
When Ralph doesn't appear in his game, Felix climbs off the side of the apartment building and exits the screen. In the next shot, he is just seen exiting the light source, indicating that he has left the screen again.
When Vanellope crashes into a rock in diet cola mountain,we see her spit out one of her front teeth and a gap is formed in her upper row. However, when she and Ralph leave for the race, when she speaks both her front teeth are visible.
When King Candy visits Ralph to tell him to stop Vanellope from racing and gives him his Hero Medal, Ralph stuffs it in his overalls. The blue ribbon of the medal is not visible on a number of shots until Vanellope spots it and then the blue ribbon is visible.
At the start of the movie, Fix It Felix Jr is at the back of the arcade and facing the door. Sugar Rush is two or three machines down. However, at the the end of the movie, Fix It Felix Jr is facing Sugar Rush, they are opposite each other.
When Ralph smashes the cake, Mary is seen stood behind Gene. She's not holding anything during the smashing, but as Ralph begins to leave the party the camera shows Mary holding onto the cake figurines which would have been smashed previously.
When King Candy enters the program he goes out the direction of Vanellope's code box. In Sour Bill's flashback however, King Candy's rope is to the left while he's pushing Vanellope's code box to the right.
The goof items below may give away important plot points.
When Ralph looks down on the entrance of Sugar Rush after being lifted by King Candy, you can see the path is empty between Calhoun, Felix, Vanellope and the cy-bugs. But when Ralph frees himself from King Candy's grip and Vanellope starts glitching towards Ralph, you can see Calhoun's discarded weapon lying on the ground. Something so distinctly black would stand out on the rainbow bridge from a distance.