Continuity mistake: In the opening scene Fay has her hands on her coffee mug - the shot changes, the coffee mug is next to her and she is holding a napkin.
Continuity mistake: In the opening scene, Roy is sitting at the counter eating. When Roy says "The Calf would probably do better on the New York Times crossword puzzle" he picks up a French fry, the shot changes and he is taking a bite out of his burger.
Is That a 10 Foot Sandwich or Are You Just Glad to See Me? - S6-E6
Continuity mistake: In the opening scene, Antonio has a cigarette in one hand and a lighter in the other. The shot changes and the lighter is now on the counter.
Continuity mistake: While in the office, Lowell puts the blueprints on the desk - there are also some other things there. In one shot, the only thing on the desk are the blueprints.