Other mistake: In episode 1x7, Barb has a list of all the family members' names and birthdays. On the list, the oldest daughter is a listed as "Amanda Henrickson". Her name is Sarah Henrickson: it's the actress who portrays her who is called Amanda (Seyfried).
Big Love (2006)
1 other mistake in season 1 - chronological order
Starring: Bill Paxton, Jeanne Tripplehorn, Chloë Sevigny, Ginnifer Goodwin
Genres: Drama
Factual error: There is a cross on the wall in Bill and Barbara's bedroom. Mormons (of any persuasion) do not venerate or use the cross as a symbol of their faith.