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".
Cisco goes on a date with Kendra Saunders but has to bail when he has a vibe about a bird-person in episode 2x07 "Gorilla Warfare".
Barry and Ralph head to the museum to stop Mina Chayton from stealing back the necklace in episode 4x06 "When Harry Met Harry…".
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 1x13 "Kobol's Last Gleaming: Part 2". New footage of the Opera House is seen in episode 3x12 "Rapture". The final bit of new footage can been seen in episode 3x19 "Crossroads: Part 1".
Edward's flashback to his hunting in the 1920's took place in Vancouver's iconic Orpheum Theatre.