@mx There are many I could point out, but here's one that's top of mind: there is a lot of US high-school English class five-paragraph-essay structure. Usually the second- or third-to-last paragraphs begin with a classic transition like

"Moreover, ____"

"Furthermore, ____"

"On the other hand, ____"

"Simultaneously, ____"

Of course no one thing is a tell, it's the overall "smell" of the thing, lots of little points that add up and a complete lack of any and all personality.