When George and Mason are arguing about her stolen bike, Mason says, "You don't have to be so huffy about it." Huffy is a popular brand of bike. Mason's character has a habit of making unintentional puns like this.
Mason, on a street corner, loses the pea game to a blind man and a curly haired woman. The man and woman bear a striking resemblance to mind reader Ludz and bearded lady Lila from the HBO program Carnival.
In Der Waffle Haus Daisy asked,"Do you know what the holy trinity is?" Rube says,"We're in a restaurant, it's pepper, onions and celery". They are in a vaguely German restaurant and bell peppers, onions and celery are the holy trinity of Cajun cooking.
A woman bearing a striking resemblance to Pauley Perrette can be seen in the police station next to the door the first time George goes to speak to the officer at the desk.
Daisy in the antique shop. There are repeated references to the cross and Catholics. A crucifix is a cross with the corpus of Jesus. While the Catholic church has no firm rule on cross vs crucifix, the general trend is Catholics prefer crucifixes and Protestants like crosses.