Deliberate mistake: The mystery begins as Winston points out the postmark on the envelope that Dan receives, it is too faint to see where it's from. But whenever we see a close up of the envelope, there is no postmark at all.
The Kid: So, as just a guy who gave another guy a sandwich, you have, like, any philosophical tips or anything, for a guy on a-kind of - road trip?
Don Johnston: You asking me?
The Kid: Yeah.
Don Johnston: Well, the past is gone, I know that. The future, isn't here yet, whatever it's going to be. So, all there is, is, is this. The present. That's it.
The Kid: Are you a Buddhist?
Don Johnston: Couldn't you have rented me, like a Porsche or some car that I might really drive? I'm a stalker in a Taurus.