Continuity mistake: Harmony's T-shirt switches between white and yellow at least twice during each episode of the series.
Firefly, Light My Fire - S1-E1
Continuity mistake: Joy exits her house twice: once after the curtains pull back, then a second time after Harmony says his line.
Firefly, Light My Fire - S1-E1
Continuity mistake: When the boys are tied up, they begin with their feet tied but in the next shot, IQ and Courage have their feet separated.