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?
Other mistake: Having thought that the kids were in trouble, or away when Jason and Maggie go away for the weekend, they call the next door neighbor to check on them and have them call them back at the hotel that they are staying, but they did not give a phone number to be called. A few minutes later, they call the police as there was no answer - and Maggie says "Jason, you didn't even give them a number to call us back" - but they didn't give the number to the neighbor, and the police would more than likely have it for caller ID reasons.