When Julia finds out that Barbie is alive and hugs him her hair is straight. After when she and Barbie stop Big Jim and convince him not to commit suicide her hair is curly as usual.
Church bells are made of bell metal which is an alloy of copper and tin (typically, 78% copper, 22% tin by mass). Both Copper and tin are not magnetic.
When steel and iron objects start sliding down the street toward the dome, a fence of steel T-posts and barbed wire in the background is still standing.
When Big Jim asks Barbie and Julia to help him hang himself a crew member is visible in the background and some other (car or people) movements.