Sometimes a specific brand is needed because of its prior associations; e.g. the Coca-Cola machine scene in Kubrick's Dr. Strangelove would not work with any other real or fictional brand (except possibly Pepsi).
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Saturday Night Live commercial – frequently featuring fictional brands, many listed with this entry
Yves Saint Laurent (brand) | Russell Brand | brand | Stewart Brand | fictional universe | Diesel (brand) | Brand | Gillette (brand) | British Rail brand names | Xuanzang (fictional character) | Fictional crossover | Brand Nubian | Adam Brand | Spider-Man: Brand New Day | Brand management | Papa's Got A Brand New Bag | Oscar Brand | fictional crossover | David Brand | You Make Me Feel Brand New | Roger Brand | Psychohistory (fictional) | psychohistory (fictional) | Parker (fictional criminal) | North Western Railway (fictional)#Thomas' Branch Line | Neville Brand | Myles Brand | Kenzo (brand) | Jet (brand) | J Brand |
In the 2013 science fiction film Elysium, the protagonist (played by Matt Damon) takes Miporol, a fictional brand name for diphenylhydantoin, after having been exposed to a lethal dose of radiation.