And Then There Was One - S2-E16
Other mistake: When the father arrives to pick up baby Emily he states his wife was having triplets the night before. Yet baby Emily in the stroller is under 6 months old. How is her mom having triplets already?
And Then There Was One - S2-E16
Revealing mistake: When Rose and Dorothy unpack the groceries, Dorothy starts to open the egg carton. It tilts backwards revealing an empty carton. You can also tell it's empty when she carries it to the fridge.
Answer: Ice makers were a new invention, advertisement purposes.