According to the commentary. Xavier Dolan (Tom) doesn't have a driver's license. When they had to shoot scenes of Tom driving his car,
the crew members who were hidden from view (passenger seat, back seat, trunk) were scared whenever Dolan had to drive.
This is the first film that Xavier Dolan didn't write on his own.
At the beginning of the film Tom composes his eulogy for Guillaume using a blue pen. Director Xavier Dolan said this is the only kind of pen he uses; it is a discontinued model, but he had ordered an industrial amount of them from the manufacturer.
Lise Roy and Evelyne Brochu were in the original production of the play.