Chronology is off. At this point in the series, Adam has spent considerable time with Megan. Script seems to be earlier in the overall story line.
When Dr. Megan Hunt and Det. Tommy Sullivan talk to Emmett and Stacey Harrington on the driveway before the house, Stacey initially has her right hand on the left shoulder of Emmett. During the conversation Emmett turns away and Stacey's hand leaves the shoulder. In a following shot Emmett stands straight again and Stacey's hand is back on the shoulder, but at the next shot Emmett is again turned away, without Stacey's hand on the shoulder.
The knife is excluded from evidence due to the search warrant listing the suspect's "legal residence" which was in Florida. That would not happen, since all search warrants are required to describe the place to be searched in detail. Using a generic term such as "the legal residence of John Doe" would never be approved by a Judge. The correct terminology would be something to the effect of "A single family residence located at 123 Any Street Philadelphia. PA 12345 and further described as a two-story stone faced building located on the West side of Any Street approximately 1/4 mile north of Main Street."