The movie is set in Oklahoma. Several references are made to execution in the gas chamber. Oklahoma has never used the gas chamber for executions. Electrocution was used from statehood (the first in 1915) until 1966, using an electric chair, "Old Sparky". Since 1977, the prescribed method is lethal injection.
There is a police car driving through a crowd and an egg is thrown at the window, you can briefly see the camera man in the right front seat wearing a jean jacket instead of a police uniform.