Generally speaking, the "trap" they use is to provoke you into lying to them, because lying to them is a felony (Title 18, United States Code, Section 1001). [1]
-- edit - I realized the URL might make it look like a slanted political article, but it's more about the law than it is about politics. The article author is the same guy that runs the Popehat website.
They will also charge you with a felony if you accidentally lie to them. If you tell them "good morning" as a greeting, and the weather is actually a bit lousy outside, they could charge you.
You really need professional coaching in order to talk to them. You'll have to program yourself to say things like "in my opinion..." or "in my memory of that event..." or "hypothetically, if..."
It's really counterproductive. Because any conceivable response could incriminate the respondent, the interviewee can plead the 5th to anything they are asked, including "is water wet?"
[1] https://reason.com/archives/2018/02/08/donald-trump-shouldnt...
-- edit - I realized the URL might make it look like a slanted political article, but it's more about the law than it is about politics. The article author is the same guy that runs the Popehat website.