After Boa Vista collects the motorcycle key chain, she throws it on to her clipboard in her hummer. As a CSI she should have placed the key chain in an envelope to maintain chain of custody and to keep it free of any possible contamination. She later gets upset when former CSI Wolfe calls her on this oversight.
Calley matches the .45 bullet pulled from the deaf girl to a gun registered to a man named Barry. The state of Florida does not register guns, nor do they keep a database of fired rounds from guns that have never been used in a crime.
When Julio Renterria is beating Trip on the bus, he clearly misses several strikes by a wide margin, despite standing right over Trip as he is dazed.