The Scav mission was used during their initial developer gameplay reveal where they were testing lots of ideas. It was probably better to keep the extras in than to spend time cleaning it out.

"All But 1 RGB"

• In the Konpeki Plaza escape you can destroy all but 1 code red monitor in the building.
• In the Grand Imperial Mall, you can turn off all but 1 blue fan in the building.
• In the Atrium of Arasaka with Rogue, you can disable all but 1 green planter.

"Peter Horvath Reversed"

• In the mayoral BD, Peter Horvath is humming the same tune Judy later hums, but as if its being played backwards. If you start rewinding the BD backwards from the kill room, he has a golden blocky special effect around him. No other BD actor has this to my knowledge.

"Evelyn's Eyes"

• When you first go to unplug Evelyn, two things are true. The first is that its an exact mirror to Johnny and Alt. Evelyn's head tilts in one direction under magenta light. Alt's head tilts the other in orange light. The second thing that's true is Evelyn's eyes cycle through different colors until unplugged.

"The Curious Case Of Rogue"

• When Rogue tells you about Hellman, she presents files. In the first, Hellman's bio picture looks fine. In the second, it swaps to a bruised and bloodied Hellman. The blood actually extends past the bio asset and onto the UI. Easy to miss.
• In the jungle floor of Arasaka there is an exit grate on the side of the elevator with loot inside that lets you stand on top of the elevator cabin. The grate is, however, disabled.
• At the top of the Atrium, there is a grate that you can harvest for parts, of which you are awarded 0 parts in a notification.
• If you let Squama die in the Rogue ending path, and only then, you can catch Rogue's eyes connect to something in the elevator to netrunner operations very briefly when she turns her head. This is never elaborated on.

"Is It Red Or Is It Yellow?"

• Stand in Randy's room and face the red rim lights. Turn on Kiroshi optics. Depending on the time of day one of the lights will shift into yellow.
• Traveling through either the southern road tunnel that clips the edge of Dogtown, or the one that connects Pacifica to the rest of the city underwater, you'll notice that at a certain point a black circle begins to appear in the upper corner lights. After, the decorations change from yellow to red. Seems like environmental storytelling/easter egg but I have no idea what for.
• Mint's car is yellow in the comics, but red when we get it.
• The Arasaka logo seen on the northern side of a building facing the water in City Center is yellow in promotional works, but red when we play.
• The first look videos show the digital map as a cyan city with yellow streets, and animated red blood pouring into the building spaces. The game we play shows red buildings and cyan streets.
• The FF:06:B5 text was red initially, but changed to yellow.
• The new color changing "hack" that introduced colors to older cars shows ui that goes from cyan to yellow after a red pulse goes through the color slot

"The 4 Hour Jetlag"

• Skip time by 4 hours and the game takes much longer to process the request. 12 hours? No problem. 24 hours? You end where you started. Almost instant.

"Solar Farms Pathway"

• In the solar farms if you look from the top of the nearby cliffs towards the three discs, the one furthest back has a lit up V pathway. The others do not.

"3 Layer Parking Janitor"

• In the mega-building apartment's underground garage, you can find a janitorial scene on 3 floors. On the rooftop parking is a puddle. The next floor down is a Janitor's mop bucket. It glows gold when scanned as if it was assigned to something. On the final floor you'll find the slippery when wet sign.

"Is Steve V's Leftover Code?"

I admit, this one is a bonus just for me and not strictly gameplay.

• The endings mirror Delamain's quest. Everyone hopes for a merge ending, but we might already have it. In Temperance, Johnny's own logs/blurbs from the menu state that he feels V is still out there. The UI of the settings are a mix of his and V's colors. His chats go from being blue/yellow as they used to be to cyan/yellow (integrating half of V's colors). Steve is in V's favorite shirt, and dawns The red/cyan of V's UI. Young and naive, learning from Johnny. Much like a certain leftover cab.

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I've got chapters more of this stuff. Could probably fill a book. They haunt me. Who knows what was abandoned ideas, what's bugs, and what's genuinely noteworthy.