To be fair, the AU and NZ customs forms are a lot more detailed and provide much better directions. Maybe the US form would be more accurately followed if it weren't filled with useless information like the Paperwork Reduction Notice (which, ironically, increases the size of the form and increases the use of paper).

I once got a snarky chewing-out by a US Customs agent because I had checked "no" to being around livestock, when I had hand-fed a kangaroo at an Aussie zoo. Personally, I think of "livestock" as farm animals, and clearly they don't, but the form doesn't go into details. Similarly, while the US asks about being in farms or pastures, NZ and AU also ask about hiking in wilderness areas. I have had my shoes checked for soil over that one.