At the end of the episode, Veronica (Kristen Bell) puts a fortune cookie fortune on her mirror. The numbers at the bottom of the fortune are the same "numbers" featured prominently on the show Lost (2004) (4 8 15 16 23 42)
The title of this episode refers to Lilly's (Amanda Seyfried) pet name for Duncan (Teddy Dunn), "Donut."
When Veronica (Kristen Bell) is on the phone with Duncan (Teddy Dunn), she stands next to a flier for "Teenage Women Of Propriety", with the first letters of each word significantly larger than the rest. This is an in-joke referring to the web site Television Without Pity (TWoP for short).
When Veronica (Kristen Bell) finds Vinnie Van Lowe (Ken Marino) in the van, she says, "Morning, Sam," and he responds, "Morning, Ralph." This refers to Sam Sheepdog and Ralph Wolf in a series of Looney Tunes Cartoons.
When Veronica and Wallace are sitting at the lunch table talking, you can see a red light spinning in the background. Those were mounted outside the metal buildings at Stu Segall studios in San Diego where they filmed Veronica Mars. When the lights went on it meant they were filming so everyone in the area needed to be quiet.