Theatre where the first murder of the episode takes place in episode #504 "Chivalry Is Not Dead…But Someone Is".
A new production of the old play is put on in episode #715 "Psych the Musical".
Mr. Yang has a vision of Mary Lightly in episode #715 "Psych the Musical".
Leonard Snart shoots up the concert hall with his cold ray in episode 1x04 "Going Rogue".
Oliver and Thea attend Jessica Danforth's campaign announcement which is attacked by Lonnie Machin in episode #402 "The Candidate".
Where Shane and Veronica Bloom argue at a film opening.
Where the Fringe team arrives at the Other Side in episode #222 "Over There: Part 1" and where Olivia attempts to return to her side in episode #301 "Olivia". This is also where Moreau attacks the philharmonic in the future in episode #322 "The Day We Died". Peter and Lincoln cross to Over There through the theatre in episode #408 "Back to Where You've Never Been".
Location of Baltar and Laura's Opera House visions first seen in episode #113 "Kobol's Last Gleaming: Part 2". New footage of the Opera House is seen in episode #312 "Rapture". The final bit of new footage can been seen in episode #319 "Crossroads: Part 1".
Edward's flashback to his hunting in the 1920's took place in Vancouver's iconic Orpheum Theatre.
The Nazis host a party to watch the launch of a V2 rocket in episode 1x04 "Party at Castle Varlar".