When Mac and Flack are in the diner just after meeting Raymond Harris, Mac's shield changes from his right hip beside his gun, to his left hip as they leave the diner.
Dr. Sheldon Hawkes is shown collecting evidence from under the victims fingernails at the crime scene. He should have bagged the hands and collected this evidence at the lab. Because if there had been any kind of breeze at the crime scene, the evidence would have easily been blown off of the paper he was collecting the evidence on.
In the diner, when Flack cites the common belief that one human year equals seven dog years, he is repeating a misconception. The rate at which dogs age varies by breed (larger dogs age faster) and a year-old dog is the equivalent of a human of 12-15 years and capable of breeding. Small dogs like terriers and chihuahuas are considered elderly at around age 11, medium-sized breeds at 10, large dogs, such as Labradors, at 8, and very large dogs like Newfoundlands and Danes at 7. For a medium-sized house dog which dies of natural causes, the average ratio of aging to humans over the animal's lifetime actually works out to be more like 5:1.