What's up with the yellow bowls around 40 minutes into S2E7 of The Last Kingdom, where Erik is eating with Sigfried? They seem like plastic or glass at best. Is this historically plausible? Or did they hope viewers wouldn't notice?
Having looked at that sequence, I see, at the table, there are brown wooden bowls, and in the background, on shelves, much lighter-colored bowls.
There's nothing about them that suggests plastic or even glass.
It could be a much lighter-colored wood. Here is a pine bowl -
Here is a maple bowl -
Ceramics and tinted glazes have been around for thousands of years, so a light/white glaze could easily be in play if it was glazed. Also, clay bowls aren't just orange. Very often they are a very pale grey, almost white before glazing, like this one -
I have a bowl that I made in a class that I left unglazed so I could use it for clay pot cooking. It started out as a slightly yellowish near-white.
I don't think this was any kind of error.
EDIT: After checking in the correct timestamped area, my original assessment holds, except I'd say those are definitely wooden. They yellow and black-ish.
Here is an image of a bowl made from mulberry wood, which is pretty yellow -
and this is one of a maple bowl that has had a food-safe oil finish added, which has yellowed the wood quite a bit, but has darker discolorations, like the ones in that scene -
In the still shown, the reflection makes it like a highly glazed ceramic bowl. I don't see why there couldn't have been glazed ceramic bowls in 9th century Britain.