The scene where Caroline was uploaded into GLaDOS.Rick the Adventure Sphere had several deleted lines, including some dialogue with the other cores.

Several of the Space Sphere's lines are unused in the final game, including a few of him regretting his desire to go into space when he finally gets there.

A folder hidden with the game files notes at one point, Cave Johnson would have successfully uploaded his mind into a Companion Cube and would be begging for Chell and GLaDOS to unplug him so he can end his eternal torment of being stuck in a machine forever bored and lonely.

Narbacular Drop was an indie game that eventually became Portal.

Development Gag: One of the achievements is called 'Narbacular Drop'.

Defictionalization: The Space Core is going into spaaaaaAAAAAAAaaaace!.

YouTube user Harry101UK 'GLaDOS-ified' it to Lowrie's approval and made a music video. In April 2015, the song was re-recorded in a studio and uploaded to the internet. They recorded it in their living room and offered it to Valve for use as an Easter Egg in the game, but it ended up not being utilized.

Cut Song: Ellen McLain and her husband John Patrick Lowrie wrote a song for GLaDOS to sing.

There's also this song (officially titled 'PotatOS' Lament'), in Latin this time, with McLain coming up with the lyrics again (according to what she calls her 'bad high-school Latin').

Jonathan Coulton was also able to write 'Want You Gone' with her in mind, allowing her to give a richer, fuller performance than in 'Still Alive'. The Cast Showoff: Ellen McLain actually sings opera this time, in Italian, to lyrics she made up herself.The blue plasma walls are also similar to official Hard Light Bridges. Ascended Fanon: Red laser fields, originally from Portal:The Flash Version.JK Simmons plays Nathaniel Burke, a professor training insurance agents in the Farmers Insurance commercials. In the trailer for the Perpetual Testing Initiative, Cave Johnson starts his speech by talking about his father, who was a 'professor of farming at the local farm college'.A Dummied Out voice clip has Cave Johnson talking about a test that might give you the ability to excrete spider silk from your fingers - something J.One of them, a manly action-hero wannabe who calls himelf 'Rick The Adventure Sphere', is a clear nod to Nathan Drake, perhaps his most well known voice role. Nolan North voices some defective turrets and personality cores.

Portal turret song lyrics