You have no idea how much copying-and-pasting this thing involves. 
Here are the solutions. I’ll announce the winners in about an hour. 
Nobody got this thing:
(well, except for the mysterious out-of-contest participant)
Image 4:
I’m blurring its description so that you can collectively try to guess it, if you want.
Exploding head of the (only) hotel customer, caused by fear when he sees poltergeist events happening in the room.
Only one person got this:
Image 8:
Green light (turned off) above the jumper board inside the factory, just on the left of the archway where the killing robots can be seen.
This is not the light in the time clocks outside the factory, which is very similar but not identical.
Places correctly guessed only by two people
Image 34:
Windows of the train that is briefly shown at the trestle trail, when the player controls Boris.
All the other images
Image 1:
Quickie Pal bathroom door (closed) seen from the inside.
Image 2:
Phone in the lounge of the Edmund Hotel, just left of the elevator doors.
Image 3:
Grill on the wall of the factory antechamber, as seen in the cutscene when all the characters enter the factory.
Image 5:
In the hall of the Edmund Mansion mansion. It’s the dome above the library doors.
Image 6:
This is the penthouse as seen from inside the elevator.
Image 7:
Painting that hides the safe in Chuck’s workshop in the Edmund Mansion mansion.
Image 9:
Nickel News, rainbow painted on the side of CopyTron3000.
Image 10:
Rocket on the floor of the wireframe version of Chuck’s workshop.
Image 11:
Hotel elevator: graffiti on the control panel.
Image 12:
Quickie Pal sign on the roof of Quickie Pal.
Image 13:
S&D Diner window as seen from B Street (not from Main Street).
Image 14:
Windows at the top of the Edmund Mansion mansion, as seen from outside the building, “Looking At” the building.
Image 15:
Delores room, cassette tape on the foreground table. Image taken during a cutscene (user interface doesn’t appear).
Image 16:
In the Edmund hotel hall, just above the revolving doors.
Image 17:
Trees at the far right of the trailhead, just before you enter the woods.
Image 18:
Vacuum tube shop cash register.
Image 19:
Monitor inside the factory, room in which a virus is installed into floppy disks.
Image 20:
Closed telephone box in the sewer, far left room from where the kidnapped agent wakes up.
Image 21:
Broken car at the left of circus entrance.
Image 22:
City limits sign in the wireframe world, on the highway.
Image 23:
This is the room that you reach after having gone through the giant fan in the factory. The image shows a gauge on PillowTron, far right of the room.
Image 24:
This is the phone in the Edmund Mansion mansion library. It’s not a phone from the hotel or the phone in the circus backstage. Those phones have a red light/button in the lower right corner.
Image 25:
Lantern inside the occult book store, above the cash register.
Image 26:
Inside of the elevator, as seen from any floor from 3 to 12.
Image 27:
Right window at the top of the radio station, as seen from outside the building.
Image 28:
It’s a graffiti on the wall of the secret room of the penthouse.
Image 29:
EASTER EGG - This image is never shown in the game. It’s a section of the circus midway that has been cut during development.
Image 30:
Sign outside the gates of the Pillow Master factory, in the wireframe world.
Image 31:
TV program “I love my cat”, shown in one of the monitors in Chuck’s offiss in the factory.
Image 32:
Lamplight at the far right of the bus station.
Image 33:
Water splashed/frozen by Franklin in the Edmund hotel fountain, in the hotel foyer.
Image 35:
Cemetery entrance on the highway. This is the column on the right.
Image 36:
Rock formation at the very left of the trestle trail (it’s where Willie was at the beginning of the game).
Image 37:
Outside Madame Morena’s shop, back of the building.
Image 38:
Pigeon “brothers” van outside the Edmund hotel.
Image 39:
Ransome posters in the circus backstage room (it’s a bit different from the poster on the wall of Ransome’s trailer.
Image 40:
Fence at the far right of A street, between the trashcan and the book store “Sale” sign.