a plot hole, plothole or plot error is a gap or inconsistency in a storyline that goes against the flow of logic established by the story’s plot. Such inconsistencies include such things as illogical or impossible events, and statements or events that contradict earlier events in the storyline.
If you take the train somewhat frequently in Switzerland, you should have a half-fare travelcard which gives you a 50% rebate on ticket prices. On nationwide travels at least. I have previously noticed this on the swiss railways’ ticket vending machines: the order of the button rows for regular and half price fares are inverted between local and national transit. I thought to myself that this surely isn’t a bug, but is intended to trap people.
And sure enough, last week I accidentally bought a full price ticket for a local destination.