Continuity mistake: The clock in Denzel's apartment changes times during Del's first visit there, when he fools him into getting Del to paint his apartment.
Continuity mistake: When Denzil's wife is in the kitchen slamming pots and pans, above Del and Rodney in the corner, Denzil's speaker, which was upside down, is now the right way up.
Chosen answer: An apparent long string of illnesses.