Live by Night

Live by Night is a 2016 film directed by Ben Affleck and with Sienna Miller as a damsel.

Story
In the movie, she is a waitress working in a saloon where gangsters play card, and that is robbed by Ben Affleck and his bnd.

After putting the money in the robbers duffel bag she stands in front of the head gangster with arms folded. When he holds up a grey sock, she is unimpressed and scoffs: "You're gonna put a sock in me mouth? A sock.....in moy mouth?" Nonetheless she obediently opens her mouth, allows him to stuff it in and wrap narrow white tape around her head twice.

The robbers leave her like that without tying her up, despite leaving all the men bound and gagged in chairs.

Errors
Obviously, leaving her gagged but not bound is absurd, as she can ungag herself and free the other men as soon as the robbers left the saloon, a terrible mistake.