My Model 3 did not come with any window paper like any other car I've ever bought. Either the Service Center took it off and threw it in the garbage, or maybe that's a state-to-state law?
If it's just for travel, I don't know if you'll really need a 14-50 adapter. Unless you're going to a friend's house and you know they have a plug, you're unlikely to ever find one of these outlets by chance. The 5-15p is a common US outlet style and should charge 3-5 miles of range per hour, so pretty limited, but would work in a bind. Otherwise there's destination chargers and Super Chargers I'd lean on. The reality is, the Super Charger network isn't big enough yet. I can't drive my car from MN (my house) to Detroit (my parents) through the UP because a lack of infrastructure. It's a bummer, but not the end of the world. It'll be there in 2-5 years I'm sure.
Your car should come with floor mats (carpet style ones, they're pretty good).
You won't get fobs. Also, I really don't like the fobs when comparing it to any other fob I've had from other cars.
Good luck!