During Sam and Joe Lee's argument Melinda drops an orange slice into her drink. In the next shot as they leave the table the orange slice is back on the rim of the glass.
When the Mickens family enters Merlotte's, there's a cut in which Tommy goes from smiling to a more serious expression.
(at around 41 min) Tara pours Jason a beer. The level of the beer in his glass is lower after the first drink and then nearly full when shown from another angle. The level goes up and down throughout the scene.