Maggie is shown talking to her sons on her computer in Seattle when the power goes out. She is telling them that it is bed time in England, while we can see out her hotel window that the sun has just set. Since Seattle is 8 hours behind England, this would mean that her sons bed time is 3 or 4 A.M. depending on what time of year the blackout happened.
The characters were shown at an amusement park while in Lowell, Indiana but Lowell had no amusement park as was shown.
While Maggie is chatting on her computer with her children before the power goes out her son calls her "Mommy". A British child would call her "Mummy"