On this video, someone pointed out in the comments a possible bug that lets you pick the mirror without using the portrait cutout on it. I haven't played in ages nor following the speedruns for this game, but just wanted to point it out here just in case it leads to something.

@Ropetupa I believe I found a slight hickup (bug?) In Goodsoup hotel. I found a way to get the mirror from the lobby, without switching it with the cutout from the painting. Some others may have found it too. But I haven't seen it in any of the easter egg-lists of this game.

@legendofmi Thanks! Can you explain how you got it and I will give it a go.

@tonib.2371 @legendofmi I always "killed" myself to get the mirror He doesn't check the inventory then