Saw this the other day and found them fairly interesting.
I'm guessing there's going to be some bias there because when you lose any optimism you had is quickly discounted from what you remember your expectation really was. Still the high proportion of people surprised I wouldn't have expected, is this an example of how populism makes people feel like they are voting for the underdog ? Were these people not watching the news or aware of the forecasts? Could just be they were surprised by the size of the majority as opposed to the win, hard to tell without knowing how specifically the question was phrased.