When Danny eats the sub sandwich on the couch, he takes a bite and closes his mouth. Then he turns to look at Veronica and ask what's up, and his mouth is slightly open.
Doug has to go to a doctor's office and take a treadmill test and a pulmonary function test. Patients taking these tests have to breathe into a tube and wear a nose clip to keep air from escaping, however, Doug wasn't wearing a nose clip.