Nintendo Switch
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5 Box Art Mistakes - VG Facts Five Trivia Feat. JonTron
 
Despite the fact that multiplayer-heavy games like Splatoon 2 required the use of a phone app for online voice chat previously, it was discovered in early June 2018, around the time of E3, that the Switch actually had the ability to have Native voice chat, a feature that was finally implement with the help of Epic Games. It can be accessed by plugging in a set of headphones with voice capabilities. Nintendo enabled this feature on June 14th with the first game utilizing it being the widely popular Fortnite.

It is unknown why this feature was previously unused.
Contributed by PirateGoofy
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The phrase "thx2allgamefans!" can be found written on the Switch Pro Controller's motherboard, just above the right analog stick; the positioning of this message allows it to be easily viewed by holding the right analog stick in the down position and peering through the surrounding socket.
Contributed by game4brains
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The first batch of Nintendo Switch consoles suffered an issue where the left Joy-Con would frequently desync as the result of a manufacturing error. This could be remedied by placing a small square of conductive foam atop the Joy-Con's antenna traces, which would significantly reduce interference. Nintendo themselves would amend the desyncing issue in later batches of the Switch.
Contributed by game4brains
To avoid anyone from possibly swallowing Nintendo Switch game cartridges, Nintendo had them laced with Denatonium Benzoate, a non-toxic bittering agent, so they would taste horrible. The agent is also known to be used in animal repellent, nail-biting prevention, shampoos and soaps.
Contributed by KnowledgeBase
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In the system's Photo Album set-up page, one of the drawn characters closely resembles the character 'GO' from the Japanese gay pornographic movie A Midsummer Night’s Lewd Dream. The film's character had become part of a popular meme in Japan which had spawned as a result of the film's over-the-top acting.
Contributed by KnowledgeBase