I also found a few videos of interest that were liked by Mr. Error. I don't know what they have to do with anything, but I guess they're cool experiences nonetheless.
https://www.youtube.com/watch?v=hx_Aj29OZyI
https://youtu.be/AFbu21AGSho
https://youtu.be/W86cTIoMv2U
(If it wasn't obvious, these channels have absolutely nothing to do with this . . . erm . . . experiment. Please do not ask them about anything retaining to this ARG experience. Anyone that does so will be ignored in any future potential discussions. If any of the channels that published the videos linked above decide to interact with the experience, that will be the one and only exception to this rule.)
The best I can gather is that Mr. Error likes animals. Yeah, that's it. I'm gonna do another look at the newest version of Error I found, and see if I can find anything noteworthy to upload to my channel.