* CastTheExpert: The doctors are real doctors. The commentary mentions that this was because actors wouldn't quite speak as if they had been using the proper terms for years because, well, they hadn't been.
* CrossDressingVoices: Played straight with E.T. in the original version and in the Japanese dub, but averted in the Mexican Spanish dub.
* DeletedScene: Creator/HarrisonFord filmed a scene as the principal of Elliot's school, set after he frees the frogs, which Spielberg cut because he felt Ford's presence was too distracting.
* EnforcedMethodActing: When Gertie bursts in on Elliot and sees E.T. for the first time, Drew Barrymore was actually scared when E.T. suddenly stretched his neck up.
* HeyItsThatGuy: The blonde girl Elliot kisses at school will (ten years ''older'', of course) end up JumpingOutOfACake for Creator/StevenSeagal in ''Film/UnderSiege''. Yes, [[MsFanservice that one]].
* HeyItsThatVoice: In the Japanese dub, who was [[TheOtherDarrin dubbed twice]].
** E.T. was voiced by the late voice actress Kazue Takahashi in the first dubbed version and the second dubbed version, he's voiced by both Ako Mayama and RicaMatsumoto at the same time (who, by sheer coincidence, they will reunite together again, except this time as enemies, as [[VideoGame/SuperRobotWarsOriginalGeneration Aguila Setme and Lilcarla Borgnine respectively]].
** Elliot is Creator/DaisukeNamikawa in the first dubbed version and one of his first roles as a voice actor along [[Anime/MobileSuitGundam0080 Alfred Izuruha]].
*** He also worked in another series that involves alien contact, [[Manga/{{Gantz}} except this time, they DID NOT come in peace]].
** Tyler is MamoruMiyano in the second dubbed version (Also one of his first roles, and also counts as HilariousInHindsight if you know one of his later roles implies [[Anime/Gundam00AWakeningOfTheTrailblazer fighting against aliens]]).
* OldShame: Creator/StevenSpielberg came to regret the edits made to the film for the 2002 re-release.
* WhatCouldHaveBeen:
** The first choice to play Gertie? Creator/JulietteLewis. Her father made her turn down the role and Barrymore was cast instead.
** Creator/StanWinston turned down the opportunity to work on ''E.T.''. He would regret doing so.
** The book "E.T. from Concept to Classic" features many plot points and scenes cut from the script. One subplot from an early draft was to have a rival to Elliott named Lance who wanted to expose E.T.. The spaceship was going to land in a parking lot, but it was changed to a forest because that sounded more magical, amongst many others.
** Appearently, the movie first started as an adaptation of the [[http://en.wikipedia.org/wiki/Kelly%E2%80%93Hopkinsville_encounter Hopskinsville "goblin" incident]], and was going to be ''much'' darker than the current result.
** There was almost a sequel where an evil group of E.T.'s people come to Earth looking for him and torture Elliott and his family for information.
** CoreyFeldman was originally up for a role as a rival to Elliott, a dork named Lance who threatened to expose E.T. The character is in the book adaptation, but was cut from the script. Creator/StevenSpielberg promised him a role in a future film, and he would go onto be in ''Film/{{Gremlins}}''.
** Originally E.T. was going to develop a crush on Elliott's mother. Some scenes of this were filmed before it was scrapped. But it did make it into the novelization.
** Here are some pictures of the original design [[http://www.avclub.com/article/et-originally-had-lipscreepy-supple-lips-205080?utm_source=Facebook&utm_medium=SocialMarketing&utm_campaign=LinkPreview:1:Default of the creature.]]
* WordOfGod: Creator/StevenSpielberg stated that E.T.'s species is more similar to plants than any other creature and is genderless. Also, a series of trading cards from the 1980s list the family's last name as Taylor.
** Creator/StevenSpielberg has also stated that this movie is a [[StealthSequel sequel]] to ''Film/CloseEncountersOfTheThirdKind''.