Mike Teavee says: "First off, there's a difference between waves and particles!". Actually there is not. All energy and matter express the so called wave-particle duality, where they can be regarded both as particles and as waves. Someone as science-oriented as Mike Teavee should be aware that this has been known since 1924. He most likely meant "There is a difference between energy and matter" which much more relevant in this situation in that energy can easily be transmitted while matter cannot, which is what makes Willy Wonka's television camera so amazing.
When Veruca looks up at Willy Wonka and the Buckets in the flying glass elevator, she asks her father for a "flying glass elevator." Being from England, Veruca should have used the word "lift" rather than elevator.
When Willy Wonka dips the pink ladle into the chocolate river, the chocolate is spilling over the edge of the ladle. But when he hands it to Charlie, the outside of the ladle is completely free of chocolate residue.
In the Nut Sorting Room, Veruca stands with her hands on the railing in front of her. There are a matched pair of shots over her shoulders where her hands are clearly visible. (The shots approximate to Willy Wonka's and Mr Salt's Points of View.) In the shot over Veruca's right shoulder the gap at the side of the gate is clearly seen between her resting hands hands. In the reverse angle over her left shoulder the handrail is unbroken.
When they are showing the winners of the 3rd and 4th golden ticket winners, there are 4 shots of Charlie watching the TV. In the first and third shot, grandma Georgina's head is upward off the pillow. In the second and fourth shots, her head is resting on the pillow laying down.
When the chocolate castle liquefies, you can see the melted chocolate hit the princess on the face in a certain pattern and a small dab on the nose. The next time we see the princess the chocolate pattern has changed.
When Mr. Salt walks in front of Wonka to go down to fetch Veruca it would not be possible because as the gate swings open it would be in Mr. Salt's way. As Wonka unlocks the gate you can see Wonka's hand opening the gate slowly and in the next scene you can hear the gate still opening, so Wonka would still have his hand on the gate which totally blocks Mr Salt's path.
While in the chocolate room, Mike is smashing a candy pumpkin. You see it break into three pieces before his dad comes over, however, when Mike is speaking to his dad, the pumpkin is in smithereens, and Mike is no longer standing in the pumpkin goo.
When Charlie receives the toothpaste cap from his father that is to become "the head for Willy Wonka", there is a shot of just his hand holding it up with the "hat" pointed upward. In the next shot, the toothpaste cap has turned completely upside down.
When Charlie is handing bits of his Wonka bar to his family members, it can be seen that he hands his father two separate segments of the chocolate bar, however in the next scene when his father goes to take a bite of the chocolate he's been given, the two segments are still attached to one another.
While the Japanese children are waiting to enter the Tokyo candy store, all of the text on the Wonka bars is written in traditional Hirgana. However, when the children enter the store, some Wonka bars are seen with the logo now written in English. These bars still retain the flavor and Golden Ticket contest announcement written in Hirgana, though.
As the sun comes up the morning after the flyers have been passed around the city, you can see an extra start to step out (then duck back in) of the doorway just beyond the flyered pole that is in the foreground.
When Willy Wonka walks into the elevator after congratulating Charlie, he falls to the floor. In the reflection of the wobbling elevator door, you can see a crew member moving. The reflection is not of Charlie's grandpa.
Augustus' home town of Düsseldorf is shown to have old-fashioned houses with wooden frames, like in a Bavarian, Austrian or Swiss town. Düsseldorf is in Nordrhein-Westfalen, where there is no such architecture. Even more so, Düsseldorf is shown to be near a huge mountain range, of which there are none even remotely to the Ruhrgebiet, which is a rather flat landscape.
The photo in the 'Russian Ticket a Fake' article shows a group of people beside St. Basil's Cathedral in Moscow. However, the article text states that the boy who has "found" the Golden Ticket lives in St. Petersburg.
When Augustus is trapped by a vacuum near the top of the pipe, the seals below him begin to blow out. A vacuum doesn't work that way, if he were blocking the pipe all the pressure would've been on the parts of the pipe between him and whatever was creating the vacuum.
At the Tokyo candy store, several Wonka candy bars appear with Katakana print on the label. The title for the candy, "Nutty Crunch Surprise" is written out as "NATTI KURANCHI SA!RAIZU". The word "Surprise" is written out incorrectly as "SA!RAIZU" while it might be more properly written out as "SAPPARAIZU!".
When the news vans are outside the golden ticket winners homes, the truck outside of Mike Teevee in Colorado has the wrong call letters. They start with the letter "W". They should start with "K" for a TV station west of the Mississippi. Also, the live truck in front of Violet's home in Atlanta has call letters beginning with a "K" instead of "W". While this is most often true, there are a few cases of call letters starting with "K" in the eastern US. Examples: Philadelphia's CBS station, KYW and in Pittsburgh, KDKA. One example of a station west of the Mississippi River that starts with a W is CBS affiliate WCCO in Minneapolis, Minnesota. (The river winds through both Minneapolis and St. Paul; the station is west and south of the river.)
It is stated numerous times that no one ever goes in or out of the factory. We later learn that those helping run the factory are Oompa Loompas, about 2-3 feet tall. However, when the group riding bicycles exits the factory at night to put posters up about the tickets, the group are normal sized adults and the movie offers no explanation as to why/how they came out of the factory or even where they went after they were done putting up posters as they are never seen again.
When the children first enter the factory, Mr. Teavee asks why it is so warm. Willy Wonka explains that it is because his Oompa-Loompas cannot stand the cold. However, we see two Oompa-Loompas on Fudge Mountain without any apparent winter clothing, and they appear to be fine.
When Mike Teavee pushes the "Television Room" button in the elevator, the elevator continues downward and then takes a sharp turn to the right. However, the actors lean toward the right (toward the direction the elevator moves), rather than moving to the left as one would as a reaction to the movement.
The goof items below may give away important plot points.
When Willy is having his teeth examined near the end of the film, the view from inside his mouth shows his lower teeth being examined, but the next shot, looking into his mouth shows his father just turning the mirror over, having just looked at his upper teeth.
When Willie goes back to see his father and the dentist examines Willie's teeth, the fingers holding the mirror completely change position between the shots from inside Willie's mouth to outside, both times. The size of the handle also changes between shots.
At Dr. Wonka's house, Charlie picks up a picture of a boy, presumably Willy. However, from Willy's flashbacks, we know he wore a head brace while he was a child and ran away from home at an early age. The boy in the picture is clearly much older than the Willy in the flashbacks and he wears no head gear.
After Mike Teavee gets shrunk by the TV ray, Willy Wonka orders him and his father to the taffy puller room. Immediately afterward, Wonka has a very short conversation with Charlie and Grandpa Joe, they get into the elevator, and blast through the roof. They then fly down over the factory entrance, where Mike Teavee is already stretched and leaving the building, just 2-3 minutes after Wonka had given the taffy-pulling order.