When Lucy is taken out of the barrel red tie marks can clearly be seen around her wrists. However when she previously took her bindings inside the barrel there were no marks.
Caleb kicks the barrel with Lucy inside into the hole and the barrel ends up on its side. When Tim finds her and the others dig away the dirt the barrel is conveniently upright.
The prison flyover when Nolan goes to visit Rosalind is of Folsom Prison. It is stated earlier that Rosalind is housed at Central Valley Women's Correctional in Chowchilla, CA.