When I see something odd - something that doesn't fit with what I'd ordinarily expect, given my other beliefs - I successfully notice, promote it to conscious attention and think I notice I'm confused or some equivalent thereof.
Example: You think that your flight is scheduled to depart on Thursday. On Tuesday, you get an email from Travelocity advising you to prepare for your flight “tomorrow”, which seems wrong. Do you successfully raise this anomaly to the level of conscious attention? (Based on the experience of an actual LWer who failed to notice confusion at this point and missed their plane flight.)