It was hard for me the first time I watched it, because I had to pay attention to them and to the subtitles(English) and then process them in my head(Romanian).
I don't think somebody mentioned the scene where Bettina paints the wall and Marc is like "I want you right here, right now" but from behind, because that way I can think of Kay and the way he tries to get into her pants, really reminds me of the forrest scene. Also, I keep wondering if he's like that because the drug effect hasn't worn off.
Oh, in the scene with the key, Kay gives Marc a look...damn, love. At least it looks like that to me. When he buttons his shirt, he scans him with such loving eyes.