"Silk Robe"?

I can't put this into the same category, because it could very easily be a deliberate attempt to attribute the mistake to the character, but ...

In the second Book of Dreams novel, when they are dreamside and changing their appearance, the narrator puts on a trench coat and "Kitteridge retailored himself as number one son, complete with Fu Manchu and silk robe." And a queue...

Now, that's just wrong. I mean, really. Have they ever seen a Charlie Chan movie? Lee Chan, Number One Son, was aggressively, modernly American. (For that matter, Charlie usually wore a western suit.) Take a look: