At the beginning of the movie, Arnold has just come back from being attacked by his coworkers...he grabs Sharon by the shoulders and shakes her, trying to convince her of what's happened. A moment later he holds up his hands, and the palms are wet with blood. There is no blood on her shoulders. Nitpicky? Yeah, probably.
Ummm, why would his hands still be wet with blood after he's killed some guys some distance away and came back to the apartment over a period of at least 10-20 minutes? They look kinda shiny, but I don't think they're wet.
Steve, Have you ever seen dried blood? It's brown. Arnold's hands were bright red. He also touched Sharon's face and nothing was on it either. Even dried blood would have flaked off onto her face or shoulders.
Actually, the blood goes to the edges of his hands, and from the back you can see that clearly blood would have shown, and also you can see parts of his 'clean' hands where blood would be so yes, it would be a slip-up.