In the opening section, I noticed some things seems interactive and give a text label when you hover your mouse over them, even though they aren't actually there.
I mostly noticed these around the car. For example the text label for the loose tire still appears after you've put it back on. Also the text for the holographic helper keeps popping up in the top left of the car interior after you've taken it for a ride.
When talking to 4-armed cotton picker (just past the checkpoint, beyond enemy lines) one of the dialogue options has a typo, it says "you're not alowed to read?" where it should be "allowed" I believe.
I'm really impressed with how much content there is here. I thought I might finish it yesterday, but no, we're still going! I've not hit any major bugs at all, just very minor things that I'm sometimes not even sure if they might be deliberate or not. Like the portraits sometimes being a slightly different size during a conversation. Maybe it's supposed to be like that, maybe not, but it doesn't really matter for me as a player.
One thing I did notice yesterday is after I installed the virus into the HQ behind enemy lines, the human and alien armies are facing each other in a cutscene all have "new character" as a label when I hover over them with the mouse. That's probably not supposed to be there? Idk.
Back on Neoliberon, where you lift up the groundcar to inspect the blood underneath, the game said I should also pick up the talisman, even though I had already picked it up before I scanned the blood.
Also, tiny typo: when talking to Lyth after the blood has been scanned, one of the dialogue options is missing a -t in "alright" (the yipee line).
In the screen where you look for the blue kid, Fluke, the coin remains on the ground even after picking it up. Also you can assemble the cure before you even find Fluke in the tent, and it's mentioned this will save him, without it being mentioned before he's in trouble.
When in the car next to the tree of life, where you zoom in on the radio to enter the number sequence, asking R3 for help also gives the option to ask Lyth in the dialogue tree.
Outside of the car, the "ray of light" is interactive before it appears.
In the screen of Lyth's bedroom, where you have to gather the foil and the camera, using the foil on the blood results in a message that has a character printed as "?" instead of text.
In the screen where Nostromo meets his cyborg wife, as well as this screen after, he's entirely blue and I'm not sure if it's supposed to be like that or not.
When first arriving on Earth, at the bottom of the sky city is a hotspot labelled "???" while there's nothing there. When you interact with it, it gives a description for Sybil.
When inside the ship, Sybil's hotspot is always labelled "???" btw.
