At one point, Charlie and Grandpa Joe sample Fizzy Lifting Drinks, causing them to float dangerously close to a large fan; they descend safely by burping.

When the tour is over, Wonka refuses to give Charlie and Grandpa Joe their chocolate prize on the grounds that they violated the contract by taking the Fizzy Lifting Drinks.

As the three fly over the town in the Wonkavator, a multi-directional glass elevator, Wonka explains that he created the contest to find a worthy successor and invites Charlie and his family to come and live in the factory.

[6] Wolper persuaded the company, which had no previous experience in the film industry, to buy the rights to the book and finance the picture for the purpose of promoting a new Quaker Oats "Wonka Bar".

Wolper promised to produce Seltzer's next film for his lack of a credit as they needed to maintain credibility by keeping Dahl's name attached to the production.

[9] Changes to the story included Wonka's character given more emphasis over Charlie; Slugworth, originally a minor character who was a Wonka industry rival in the book, was reworked into a spy so that the film could have a villain for intrigue; a belching scene was added with Grandpa and Charlie having "fizzy lifting drinks"; the walnut-shelling squirrels changed to golden-egg-laying geese; and the ending dialogue.

[9][10] Seltzer also created a recurring theme that had Wonka quote from various literary sources, such as Arthur O'Shaughnessy's Ode, Oscar Wilde's The Importance of Being Earnest, Samuel Taylor Coleridge's The Rime of the Ancient Mariner and William Shakespeare's The Merchant of Venice.

[c] Seltzer could only recall the overused phrase to fairytale endings therefore reworked Wonka's final line to Charlie: "Don't forget what happened to the man who suddenly got everything he always wanted?

In the United States during the 1960s, the term "Mister Charlie" had been used as a pejorative expression in the African-American community for a "white man in power" (historically plantation slave owners) and press reports claimed the change was due to "pressure from black groups".

[15] Gene Wilder wanted specific changes to Wonka's costume, including what type of trousers the character should wear, "the color and cut" of his jacket and the placement of pockets.

[21] Joel Grey was the front runner for the part but director Mel Stuart decided he was not physically imposing enough as the actor's height was five-foot-five.

[9] Ten actors of short stature were the Oompa Loompas, including one woman and nine men, and were cast internationally from France, Germany, Malta, Persia (now Iran), Turkey and the United Kingdom.

[31][14] They were portrayed by Rudy Borgstaller, George Claydon, Malcolm Dixon, Rusty Goffe, Ismed Hassan, Norman McGlen, Angelo Muscat, Pepe Poupee, Marcus Powell, and Albert Wilkinson.

[32][33] The child actors who were auditioned from hundreds, Julie Dawn Cole, Denise Nickerson, Peter Ostrum, and Paris Themmen, all had acting experience from stage, school, theatre, television or commercials.

[36] It was also significantly cheaper than filming in the United States, and the primary shooting locations in Munich, Bavaria, West Germany were conducive to the desired atmosphere for Wonka's factory.

Stuart envisioned it differently as a wacky inventor's laboratory, with Rube Goldberg type mechanisms and unusual contraptions, and wanted it redesigned to be like Wonka's personality.

Goff sent his construction crew into Munich searching junkyards, bakeries, and car dealers for discarded machinery, tin funnels, and any other raw materials.

This included building Wonka's three-course gum machine, which was originally a solid state device, but Stuart requested an appliance whose operations had a visual experience for the audience.

[36][41] Stuart also instructed Goff to have all the props, furniture and fittings, excluding the light bulbs, in Wonka's original office to be cut in half, to reflect the character's eccentricity.

[31] The director gave explicit instructions not to allow the child actors to see the Chocolate Room set until the day of the shoot as he wanted their reactions to be genuine.

[48] Similarly, when Wilder rehearsed the Wonka office scene, with Peter Ostrum as Charlie and Jack Albertson as Grandpa Joe, it was in a much calmer tone.

Stuart lamented in his book Pure Imagination: The Making of Willy Wonka and the Chocolate Factory, that his favorite scene was cut after poor test screenings.

"[49] When interviewed for the 30th anniversary special edition in 2001, Wilder stated that he enjoyed working with most of the child actors, but said that he and the film crew had some problems with Paris Themmen.

[53][54] For the promotion before its release, the film received advance publicity through TV commercials offering a "Willy Wonka candy factory kit" for sending $1.00 and two seals from boxes of Quaker cereals such as King Vitaman, Life and any of the Cap'n Crunch brands.

[73]Charles Champlin of the Los Angeles Times praised the film as "lively and enjoyable" and called Wilder's performance "a real star turn", but thought the songs were "instantly forgettable" and that the factory looked "a lot more literal and industrial and less empathic than it might have".

The site's critical consensus states: "Willy Wonka & the Chocolate Factory is strange yet comforting, full of narrative detours that don't always work but express the film's uniqueness.

[1][81] By the 1980s, the film had experienced an increase in popularity due to repeated television broadcasts; it also gained cult status with a new audience in home video sales.

[98] All lyrics are written by Leslie Bricusse; all music is composed by Anthony NewleyVarious comedy TV series have referenced the film, mainly as a parody.

[99][100][101] Animated TV series have also done parodies respectively, Dexter's Laboratory ("Golden Diskette" in 1997); The Simpsons ("Trash of the Titans" in 1998 and "Eeny Teeny Maya Moe" in 2009); Futurama ("Fry and the Slurm Factory" in 1999); Family Guy ("Wasted Talent" in 2000); Hi Hi Puffy AmiYumi ("Taffy Trouble" in 2004); South Park ("Le Petit Tourette" in 2007); Rick and Morty ("Tales from the Citadel" in 2017); and American Dad!

[104][105] In 2001, the music video of Alien Ant Farm's song "Movies" paid homage to various Hollywood films and included a scene in which the band members were dressed as Oompa-Loompas.