Roy's racecar in the photos of him on the bar at the end is the same car that causes the crash in FD4 - you can see it in the end credits rerun of prior film scenes. See more...
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Continuity: 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.
Continuity: During Isaac's death in the massage parlor, after his phone rings during the acupuncture scene the elderly woman takes his phone and puts it on the edge of the shelf near a candle, however in the next shot the phone is not on the edge of the shelf but further into the shelf and right next to the candle.