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".
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".