In the part where everyone (Burns and Fockers) are having breakfast there's a part where someone says that the breakfast is great and Bernie says "Well a lot of the taste comes from this old skillet, I never wash it". And then Jack looks in his cup, maybe thinking "I wonder if he washes any of his dishes??" The cup he looks at is cleary blue, then they cut away for a second and go back and all of the cups on the table are red, including Jacks. He even takes a sip from a red cup. Where did the blue cup go??