I was wondering why Father Oliver talks about his past in Montréal because the actor is French (he says a few french words and his accent gives him away). It finally made sense to me in the credits : the film is dedicated to the memory of "Father Père Robert Massé" (since Père means Father, it's like saying "Father Padre Gonzales" for a Spanish priest). This French-Canadian priest, born in 1941, belonged to the Clerics of Saint Viator congregation and spent many years in Taiwan where he taught music (many other Viatorians taught music). He was born in Saint-Barthélémy, a small city 80 km from Montréal. He did go back to Canada later in life but probably not to live with his lover since he was active as a priest until his death in 2013. You can see a picture of him at https://viateurs.ca/wp-content/uploads/2013/09/messe-commemorative-robert-masse.pdf

(Other linguistic detail : as a French-speaking Canadian, the priest's name would be Olivier instead of Oliver. )

I smiled at some details from the Québec sequence at the end of the movie. Chang Jia-han visits a gay bar in Québec City during daytime, then visits the Niagara Falls and is back at the gay bar in the evening (OK, probably not the same evening because he's not wearing the same shirt). He must own a supersonic jet because the Niagara Falls are 900 km away from Québec City. We also see two lesbians who seem to spend all their time at that bar because we see them in both sequences. And why does the manager ask Chang Jia-han to leave because he's about to close, while other customers are still at the bar ? The last scenes were filmed at the Place Royale in Old Québec where a short scene from Steven Spielberg's Catch Me If You Can was also shot (though it is supposed to depict Montrichard in France).