There's a puzzle that explains about a two-lane highway where a 1-hour traffic jam would have 100 cars. The question is, if the only cause for a traffic jam are the cars, how many cars minimum would it take to cause a 3-hour traffic jam.
The trick is of course that you only need to count the cars at the front, since they're the ones that cause the traffic jam. That would be 2 in normal circumstances but 1 if one car is parked sideways on a freeway for 3 hours straight, for some reason. So, you could absolutely realize the trick but since the game requires a numeric input, you need to guess if the game accounted for the possibility of a sideways parked car or not. In this case, yes. The answer was 1 because having a car parked in the middle of the freeway, sideways, seems like something plausible.
One of my 'favorites' is one where you're asked to cross a river. You have sandbags with you, and the river has variable depth. You can't cross diagonally, and you have to use as many sandbags as is indicated in the picture. The question is what the minimum amount of sandbags is that you need to cross.
The answer is 5, because the trick is that apparently you can hoist up the sandbags from the river after you used them. But if you can freaking hoist up the sandbags from the river, it's shallow and mild enough for you to just trudge through it without any need for sandbags, so the answer should be 0 then. But the game didn't account for that, and there is no way for you to know what the game expects of you. Does the game expect you to not reuse sandbags? Does the game expect you to reuse sandbags? Or does the game expect you to just walk through the river? You just don't know and you'll have to guess.