Continuity mistake: When JP is talking to Marlon who is having lunch, Marlon's napkin keeps alternating between blowing in the wind and hanging freely.
Continuity mistake: JP and Rosie go from having twins in episode 10.3, to having only a daughter in 10.8.
Answer: There's probably no particular reason. Sets and props on long-running TV shows often change as needed and for various reasons throughout a series run.
raywest ★