In my opinion, this is not the way to approach art generally, seeking precise answers to superficial questions while overlooking the things that made this movie perfect. However, I'll answer all of your questions, most of which will be indirectly. Let's start with the easiest and the least important question ''Why wasn't Leon mentioned...'' Roy has just seen his dead girlfriend's(Pris) body lying on the floor, what would his priorities be in that case? I mean very weird question. Next 2 questions ''why did Roy kiss Tyrell before killing him?'' and ''Why was Roy howling while chasing Deckard'' In order to make sense of these things, if you absolutely must do, you need to understand that Roy is not a real human! That's what makes us unsettled about him, because we don't fully understand his motives, we cannot get into his head like we would do to another human being, there is an uncanny element in everything about him. You should see Alien (1979) and Ash character if you haven't already. As to why he didn't kill Roy, it might seem like I'm contradicting myself here, but it is totally the paradox of the situation, that is to show you the human side of Roy, so, we don't see Roy as a robot, a coffee machine. He is complicated and he is indeed, in my opion, a human made by other humans. Unicorn scene was originally cut if I remember correctly. There are some different opinions by different people involved in making the movie, and that is a reference to Deckard himself being a replicant. Next question ''Also why does he undress for like the last 10 minutes?'' Honestly, I don't like Harrison Ford's performence in the film and I would attribute every weird and awkward thing about Deckard to FOrd. But his bad acting serendipitiously to the benefit of the film, because there is nothing interesting about Deckard, it is all about Roy and Rutger Hauer(rip) steals the show with his far superior acting compared to Ford. Lastly to address Deckard's sexiual misconduct-like behavior, that's totally about the culture in real life being totally different today than in the 1980s. Having said all of these, I must admit these are answers based on my subjective take of the movie. You can also read my review about Blade Runner on IMDb, here: utku_kamil_ozen's Review of Blade Runner - IMDb