When Zena gives Charlie the bottle of beer, he picks it up twice.
When Duprey is in the tavern eating, he picks up the beer and drinks from it. In the very next shot, the beer is still on the table untouched.
After Zena and Charlie have sex, Zena pulls a shirt over her shoulders, and in the next shot she doesn't have it on and her shoulders are bare.
Crew or equipment visible
Reflected in car when Charlie drives away from the "leak" stop.
When Zena's body is first discovered in the bathtub, you can see her blink several times.