To be more convincing as a blind man, Jeff Daniels spent time at the Michigan Commission for the Blind Training Center in Kalamazoo, observing and learning some basic skills used by blind people on a daily basis.
When Chris Pratt calls Gary to arrange where to return the money, he tells him to meet him at 6 AM, meaning that it would be earlier than 6 AM when the call was placed. However, it's already light out, even though the sun does not rise in Kansas City until after 7:35 AM at the time of year the movie takes place (Christmas).
Highway signs for Route 24 show the number in a sunflower, which designates it as a Kansas state route. But the Route 24 that passes through the Kansas City Metro area is a U.S. Route, and would have a different type of sign.
If you look at the Jetta that Chris drives, you will notice that the amount of damage to the bug-deflector on the front of his car changes almost every time we see the vehicle. It starts off with the left side of the bug deflector missing, then both sides are missing and finally it goes back to just the left side missing.
Chris Pratt: I started skating again. I'm not as good as I used to be, but I'm okay. What happened that night along Route 24 is a part of me now. I just hope that one day Kelly will be ready to see me again and I can finally tell her what I've only been able to say in my dreams. Until then, all I can do is wake up, take a shower, with soap, and try to forgive myself. If I can do that, then maybe others will forgive me too. I don't know if that will happen, but I guess I'll just have to work backwards from there.