As Daryl and Rosita ride up to the group to inform them about the bridge being out, if you look closely at Rosita's back, you can clearly see a wireless microphone pack attached to her.
None of the cars on the streets of Washington, D.C. have any license plates.
When the group enters the museum, a Georgia state seal is visible on a pane of glass in the lobby, even though they're supposed to be in Washington, D.C.
There is no Dufresne County in Virginia.