* AndYouThoughtItWouldFail: Before its release, there'd already been three OvernightAgeUp comedies [[FollowTheLeader made between 1987 and 1988]]: ''Like Father, Like Son'', ''18 Again!'' and ''Vice Versa'' (not to mention the Italian film ''Da grande'', which was this film's direct inspiration), so many expected this film to tank and be forgotten. Instead, ''Big'' became the highest-grossing and most highly-praised film of the bunch.
* BetterOnDVD: The extended cut elaborates further regarding Josh's wish to be big.
* EsotericHappyEnding: {{Website/Cracked}} has a particularly disturbing interpretation regarding [[http://www.cracked.com/article_18793_5-reasons-big-had-most-depressing-happy-ending-ever.html the movie's ending]].
* HilariousInHindsight:
** Creator/TomHanks' character works at a toy company. Years later, Hanks would star in [[WesternAnimation/ToyStory another movie involving toys]].
** The film features ProductPlacement for Pepsi. [[http://io9.com/5722906/the-real+life-location-of-the-zoltar-machine-from-big-is-now-occupied-by-a-pepsi-machine The location where the Zoltar was at the end of the film is now occupied by a Pepsi machine.]]
** At a board meeting, Josh is unimpressed by a Franchise/{{Transformers}} style toy that turns into a building, asking "[[WesternAnimation/BeastWars Couldn't it turn into a bug? Like a prehistoric bug?]]".
** At Josh's apartment, he has a model of a Saturn V rocket from the Apollo space program. Several years later, Tom Hanks would star in ''Film/{{Apollo 13}}''.
** Overlapping with TechnologyMarchesOn, Billy scoffing at Josh's interest in computer work is pretty funny now that computer skills are a very helpful thing to have.
*** The movie actually seems to have been aware of this, as it's his computer skills that get Josh a job.
*** Josh's idea for an electronic comic may also count as Defictionalization or LifeImitatesArt. While electronic texts existed in the late 1980s, e-books didn't start out-selling print books until [[TheNewTens the 2010s]].
*** The electronic comics are cartridge-based as well. Forget e-books, they predicted the UsefulNotes/GameBoy!
* {{Misblamed}}: For a time, in Italy, this movie was considered an unofficial remake of "Da Grande" (an Italian movie with a very similar plot, aired a year before "Big"). It was actually just a coincidence, as the OvernightAgeUp theme had already been used in 1950s American movies.
* NightmareFuel: The Zoltar machine. Its overall appearance is bad enough (especially the glowing eyes when it's "working"), but the breathing sound it makes and the way the mouth opens and closes hugely is extremely disturbing. The scene when Josh discovers it's not plugged in thus manages to actually be chilling.
* SignatureScene: Josh and Mr. [=MacMillan=] playing the floor keyboard at FAO Schwartz.
* TearJerker: It's a short moment, but Josh crying for his mom during his first night as an adult in a motel. All while he hears someone outside his room shouting on the phone in Spanish and banging on the wall. Josh pushed the mirrored cabinet to block the door.
* ValuesDissonance: It's portrayed as sweet and romantic, but many people have pointed out that [[http://www.culturalimperialist.com/2010/08/big-love-outraged-tom-hanks-underage-sex/ Josh and Susan's relationship is technically pedophilia]].
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