I'm thinking about like clothing, architecture, furniture, musical instruments. Would people of the time generally just assume the material culture of any place and time looked like their place and time?
More can always be said on the matter if anyone would like to have a go at this particular anachronism, so if anyone passing by would like to write a post of their own, please don't let this linkdrop stop you!
For the meantime, as this is one of the more commonly-asked art history questions, we do have some previous posts on the matter. u/Wagrid covers the same matter here, and u/ARHistChalAl looks at some more reasons.