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...that GLaDOS', Turrets' and Caroline's voice actor, Ellen McLain, also voices the Administrator in Team Fortress 2 and the Overwatch in the Half-Life 2 series?
...that GLaDOS stands for Genetic Lifeform and Disk Operating System?
...that Ellen McLain is also an opera singer and sang the Turret Opera?
...that Valve employee Richard Lord was the original, placeholder voice for Wheatley?
...that Portal 2 originally wasn't going to have portals?
...that there were plans for "sticky gel" in Portal 2?
...that both Portal and Portal 2 derived many of their ideas from prototypes made by Digipen students?
...that the cake in Portal is a Black Forest cake that project lead Kim Swift chose at a nearby bakery?

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...that Ellen McLain wrote a song to be used as an easter egg in Portal 2, known simply as "GLaDOS' Song"?[1]

...that High Energy Pellets are reused almost directly from Half-Life 2 (still called "Combine Balls" in the game files), and were also once planned to be in Portal 2?

...that multiple cakes can be seen on GLaDOS's monitor just before Portal's boss fight?

...that Portal 2 internally has four "acts", separate from chapters, shown by map names and referenced in developer commentary (Chapter 6 was referred to as "Chapter 3")?

...that in Portal Test Chamber 16 you can move the wall blocks from Rattmann's den through portals and kill turrets with them?

...that in a 2006 build of Portal, GLaDOS was a floating cube of Half-Life 2 rollermines?

...that there is a cut testing element which slows you down

[2]

...that Wheatley originally was named Pendleton?[3]

...that GLaDOS was conceived as a passive-aggressive female version of HAL 9000, toying with the player between puzzles?[4]

...that Portal was heavily inspired by the 2005 game Narbacular Drop, whose development team was later hired by Valve to work on Portal?[5]

...that the original 2013 version of The Stanley Parable features a playable section based on Portal? [6]

...that The Stanley Parable contains console commands for spawning several objects from the Portal series, including the Weighted Companion Cube, Weighted Storage Cube, Edgeless Safety Cube, and Discouragement Redirection Cube? [7]

...that Cave Johnson was originally intended to speak with a natural Southern/Western accent?[8]

...that an Oregon Coast Aquarium advertisement featuring a fish repeatedly saying "aquarium" inspired the concept of Space Core?[9]

...that an early idea for Portal 2 involved GLaDOS becoming jealous of Chell spending time with personality spheres? [10]

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