Episode #1.5 - S1-E5
Continuity mistake: The day that they received Mr. Gardiner's express letter, Jane is wearing a pink gown and Elizabeth a white. The next scene is possibly that evening before bed where Elizabeth tells Jane she wishes she never told Mr. Darcy about Lydia. The following scene looks like the next day, when Jane and Elizabeth tells Mrs. Bennet about the letter, and they are wearing the same outfits from presumably the day before. When Elizabeth goes down to her Father and they start talking, she says, "considering what we thought only a few hours ago." Which means the before bed scene was cut from after Lydia's and Wickham's wedding, because it shows a flash to Mr Darcy. Which is the same scene of him at the wedding which hasn't happened yet.
Episode #1.5 - S1-E5
Continuity mistake: Jane and Lizzy are talking in Lizzy's bedroom about how Lydia's elopement has affected their chances of finding respectable husbands. The cream-colored shawl on Lizzy's left shoulder appears and disappears depending on the angle. (00:31:35)
Answer: The children were probably left with a nanny or relatives. It's very likely that the Longborns would have left them at home. Travelling for days by horse-drawn carriage over bumpy dirt roads is difficult in the best of circumstances, and particularly hard during winter. The trip would be too arduous for young children.
raywest ★