How about Keith's poster: "She's 18, it's legal - Re-elect Don Lamb"? And the fact that he had them prepared ''ahead of time''?
Earlier in that episode, when Keith goes to Cliff's hotel room (his note to Veronica: "Gone on puzzling errand"), only to find Cliff handcuffed to the bed.
Keith: So, can I ask you a question?
Cliff: She said her name was Daphne.
Keith: Oh, no no. How did you call me?
Cliff: Acrobatically. I might have pulled a hamstring.
Also, a particular stoner would like to inform you that he'd make a great bait! In fact, he'd be a "master bait"!
"They're probably up there making love. Or playing Dungeons & Dragons. Or both. At the same time."
Logan: It does. It means I'm getting laid. And I owe your village a goat.
Logan introducing Kendall to Trina:
Rode Hard, meet Put Away Wet.
In "The Girl Next Door", Veronica is trying to track down her missing neighbor Sarah, and she thinks Sarah's friend Adam, who manages a clothing store, knows something. When he refuses to talk, Veronica calls Weevil, and he and the rest of the PC Hers come to the store, generally making a mess of things. Then Veronica walks back in:
Veronica: Guys! Remember, no white after Labor Day!