I think the idea that performers and characters are not the same when they are not performing or playing their character is something that's quite common. It's not really an insight into introversion and extraversion, but about popular culture.
After all the only information about a person that we get is from what we see and hear. It's healthier to expect and notice that a celebrity is not the same when not performing.
One example where some people have difficulty realising that celebrities are not normal is when the celebrities play The Bad Guy and people encounter them in the street and get negative responses. Whereas if they usually played The Good Guy then any equally as false positive reactions could be attributed to their normal character.
Another example from last millennia which is similar would be fans of authors expecting their idols to be erudite dinner guests, founts of wisdom, or the swashbuckling hero of their work. The author would have to point out that their novel took 12 months to create and a further 6 months of editing and they were not the same person as the lead character and that they lived with their aunt and collected roses as a hobby.
After all the only information about a person that we get is from what we see and hear. It's healthier to expect and notice that a celebrity is not the same when not performing.
One example where some people have difficulty realising that celebrities are not normal is when the celebrities play The Bad Guy and people encounter them in the street and get negative responses. Whereas if they usually played The Good Guy then any equally as false positive reactions could be attributed to their normal character.
Another example from last millennia which is similar would be fans of authors expecting their idols to be erudite dinner guests, founts of wisdom, or the swashbuckling hero of their work. The author would have to point out that their novel took 12 months to create and a further 6 months of editing and they were not the same person as the lead character and that they lived with their aunt and collected roses as a hobby.