Yes, 19 chapters in, they are still more amazed at simply frying fish, than they are about using a freaking PLASTIC bottle to pour sauce on it.
Let's not even mention the gaz stove, or the faucet of infinite water...
@Robbini the bottle might be glass, but it's cork is clearly in plastic. They look exactly like the ones you can find in supermarkets all over our world.
The three North Kingdoms are most likely that world's versions of Norway/Denmark, Sweden, and Finland.
Edit: Also the little girl from the earlier chapter is most likely the little sister of the current Emperor, who was married off for a political alliance.