Weirdly enough, time travel honestly seems like a more likely explanation to me than the idea that someone managed to abduct me from my own bed, transport me hundreds of miles to a previous place of residence and then rope dozens of people (most of them complete strangers to each other) into pretending that it is somehow the year 2001 again. Really, there just isn't anyone who can actually do that. It's logistically unfeasible, nevermind incredibly illegal due to the breaking-and-entering and days-long sedation that would be required to set it all up.
"I must be dreaming/hallucinating" never seems to me like it's a reasonable thing for someone to think, either. Practically by default, one of the most defining qualities of dreams is that you don't question the things you experience while you are dreaming. Hallucinating does not feel anything like being rational and fully awake, either. You might not be able to recognize that you are not in your right mind while experiencing them, but if you look back on it in retrospect, there would be no way for you to mistake the experience for something actually real.
It's okay when it's depicted as the character being in a panicked denial about their situation, but it does bother me when it's presented as something that anyone would actually believe. "I must be in a coma and imagining all this" is the kind of conclusion you could really only ever come to if you have literally never slept in your entire life.