When Eames is talking with the suspect's husband in his office, she sits down and blots her blouse with a wet napkin. In one shot, she wets the napkin with a water bottle and sets it on the desk. Two shots later, and within seconds, she does the same thing.
Ferries are regulated by state and federal mandates to check for operations and safety per shift. This means that all areas of the ship are visually inspected. There is no way that a human body could have remained on board of one for more than few hours and not several days as the narrative suggests.
After Eames enters Barry Carlson's apartment, green tape for the actor's mark can be seen on the floor a few feet behind her.
When Goren meets Nelda at her apartment (and helps her with her groceries), as she's walking inside you can see the camera crew and equipment in the reflection of the glass.