I'm so happy that these Thai production companies have the money for historical dramas, but they're so hard to watch. First Memoirs of Rati and now Interminable.
Before WWI, men wore starched detachable collars that have a higher rise than post WWII collars. Yai's tie should look different compared to the 1940s tie that all the men are wearing in the party scene.
Aunt Nid would be wearing a hostess dress with some sort of waist cinching. Her red dress with lace sleeves is too modern.
Even after WWII, a rich family like Ruedee's would try to have the most fashionable and up to date house. The glassware is too modern. The lip of the glass usually curved out. They wouldn't have an outdated victrola (with a needle that doesn't even touch the record), they'd have a record cabinet. They wouldn't have a copy of the Mona Lisa on the wall. The Mona Lisa wasn't internationally famous until the 60s and 70s.