Factual error: In the episode entitled 'Paper or Plastic' where Lucy gives birth, she gives birth in the elevator and when the doors open she is standing there holding her daughter. I can excuse the standing minutes after giving birth, but she is still fully clothed. The paramedics would have removed her skirt and underclothes so as not to ruin them (giving birth is messy) and they would not have redressed her. She is then shown laying on the gurney fully clothed, no blanket covering her.
Continuity mistake: In the Valentines Day episode when the whole family is waiting to be seated for dinner, they show a shot of Kevin holding baby Savannah, she is asleep against his shoulder. They switch to a shot of Simon and Rose saying hello and switch right back to Kevin and baby Savannah, who is now wide awake sitting up in his arms.