During the bridge collapse scene, when Olivia is crawling on the beam, she is first seen on the part of the beam that is closer to Sam. Almost instantly afterwards, she is on the part of the them that is closer to Molly. The space between the two beams increases significantly between the two shots as well.
In the scene after Candice dies the guys are at the office having a drink. Watch carefully - when Olivia is leaving she knocks a photo on the floor; this is a photo of her and a friend. Look at the bottom right of that picture and you will see the logo of the roller coaster From Final Destination 3.