Wendy Makkena (playing Sherri Gibson) has worked with Michael Weatherly (Jason Bull) before. In several episodes of NCIS, she played the psychiatrist sister of Tony DiNozzo's murdered co-worker, Caitlin ("Kate") Todd.
When Bull n Walter have Tiffany in the Pizza parlor, Tiffany gets up from the table and walks away. The next shot shows Walter taking a piece of pizza with prongs down headed to his mouth . And the next shot shows Walter putting the piece of pizza with prongs up into his mouth.