Continuity mistake: In the "I Want it Now" musical number, Veruca grabs some golden egg wrapper and throws it on Wonka. When she does, the table with the wrapping is immediately behind her, but when the scene cuts to her after she has thrown the wrapper on Wonka, the table has disappeared.
Continuity mistake: When the guests enters Wonka's Fizzy Lifting room, Veruca Salt and Mike Teevee are standing next to each other, when Mike turns away from Veruca and takes a step. The next shot shows them both close together again.
Continuity mistake: When Grandpa Joe, Charlie, and Willy Wonka get into the Wonkavator for the first time from Wonka's office, the Wonkavator has a plain hexagonal shape. As it flies over the city, however, it sports an elaborate design complete with an ornate minaret on top.
Continuity mistake: In the scene where Wonka shows the tour the Everlasting Gobstopper machine, you can see that the candy is already on the finished belt before he turns it on. In the close up of the candy, there are a lot of extra candy, but after they get passed out, the excess is gone.
Continuity mistake: When Wonka hugs Charlie saying he won, Wonka's hair at his left is unruly. When he invites "Slugworth" in, his hair is back in (better) shape. (01:35:05)
Continuity mistake: When Wonka introduces the geese that lay the golden eggs, the geese change positions between shots.
Continuity mistake: When they are all in the inventing room, and Mike TeeVee is eating the explosive candy, you can see the explosion come out of the machine he is standing next to. In the next scene, when Mrs. TeeVee is leaning over him, he blows out a puff of smoke like it had come from his mouth.
Continuity mistake: When Violet is introducing herself to Willy Wonka, her purse strap is resting beneath her collar. When Mr. Beuregarde pushes her away to introduce himself, the strap has moved above her collar.
Continuity mistake: When Wonka comes out of the factory to greet his guests, we see from a far away shot that he comes to the corner of the red carpet. When the scene cuts to a closer shot, he is coming up on the same corner again.
Continuity mistake: In an overhead shot of Wonka's boat, Charlie faces to the left, but in the closeup Charlie faces to the right.
Continuity mistake: The centermost of the five "Eggdicator" stalls is missing the plastic bowl that drops the egg onto the trap door, as shown in the "good egg/bad egg" shots earlier.
Continuity mistake: When Charlie's mom and grandparents are watching the TV, hearing about the end of the Wonka contest, look at the TV. In the first shot, the left panel of the TV housing is missing. In the next immediate shot it is there, and remains for the rest of the scene.
Continuity mistake: When Willy Wonka first opens the door to the chocolate room for his guests, the long, shrinking corridor they've all just walked down is no longer behind them. Instead, there's now a short patio with a huge wrought-iron gate. (00:54:20)
Continuity mistake: When Charlie's grandad falls on him soon after getting news of his Golden Ticket win, one of the other old guys in the bed has a shocked look on his face. In the next shot however, the old guy now has his hand over his face and not enough time has passed for this to occur.
Continuity mistake: When the kids stick out their hands to receive gobstoppers, Mr. Salt, who is standing behind them, changes position between shots.
Continuity mistake: When Willy Wonka comes out of the factory to greet the children who will be touring that day, he walks down a red carpet. A minute or so later the lucky children walk up the same carpet. As the scenes cut back and forth between Wonka and the children the viewer sees a shadow on the carpet of the building next door. At one point the shadow has shifted noticeably and then reverts to its former position.
Continuity mistake: When Charlie first comes home after he's got the golden ticket, he hands the ticket to his grandfather to read. After he says, "You've done it Charlie." and hands the ticket back to Charlie, look carefully. The ticket is thinner, less wrinkled, and doesn't have any writing on it.
Continuity mistake: When Charlie visits his mother at the Laundry, he sits down at the washing bowl. When you see Charlie from behind you can see the big wooden spoon sticking out of the bowl. When the shot turns to the front of Charlie, he is stirring the laundry with the spoon. In the next shot of Charlie from behind the spoon is in the exact same spot as previously - it hasn't moved.
Continuity mistake: While Charlie and Grandpa Joe are floating toward the fan, it is spinning in a clockwise direction; seconds later, when they get dangerously close to the fan, it is now turning counter-clockwise.
Continuity mistake: At the end of Veruca's song she sings "Don't care how, I want it now". In one shot her hands are at the far sides of the box, but in the next shot they are together at her sides.
Chosen answer: In the original book, Charlie has an obsession with chocolate that he only satiates once a year on his birthday. Also, at this point in the book, the Bucket family is going through an extremely hard time and Charlie has had less food than he usually would have, so he is EXTREMELY hungry.