There seems to be confusion on the spelling of the word Theater or Theatre at the DLR. The Hyperion Theater is spelled '-er', while the Carthay (the original and the DCA version) is spelled '-re'.
Meanwhile, we have the Tomorrowland TheatER, but the Fantasyland TheatRE (yesterdayland). The latter makes sense since it's got an Faire flair to it.
Master Gracey on the DCA Tracker and the Yesterdayland site both get certain spellings wrong.
Is there a rhyme or reason to Disney's choice for ER or RE? What other theaters have I missed.
I personally use (and many dictionaries and grammar books back me up) Theater to refer to the building, Theatre to refer to the craft.