When Pam cries in the basement of Fangtasia, real (clear) tears run down her face, in addition to the red blood tears that vampires cry in True Blood lore.
When Sookie loses control of the car, you can clearly see that it is a man driving it wearing her clothes and a blonde wig, when there are exterior shots.
When Bill and Jessica are searching Bill's office in their home, Jessica asks what he's looking for. Bill replies "a bug. A recording device, a transmitter, anything of the sort." He says this aloud in a normal tone of voice, making it likely to be heard by whomever may have been listening.