Continuity mistake: Elizabeth's hair length doesn't match while on The Ferris Wheel. The shot from the ground is very long hair 'draped' over the back of the seat. Yet, in the following close shot of her, it is from the chest up, so only the very bottom strands would be visible over the edge.
Continuity mistake: Or revealing mistake: Olivia's hair is suddenly long and braided in its "normal" length after her disastrous perm in the last episode 'The Rebellion'.