• According to a drama major in one of my classes, a theater (-er) is a place, while theatre (-re) describes the acting profession. And here I thought it was just a British variant spelling still acceptable in the US.

• “Thespian” to describe an actor derives from Thespis of Icaria; “Thespian” as a demonym describes someone from Thespiae in Boeotia. These Thespians were with the Spartans at Thermopylae (not that the movie 300 shows them).