The B.A.U. recognizes the lyrics to the song "Here Comes My Girl" and decides that it must be the "audible signal" the unsubs are using, saying, "That's the song that was playing when we pulled in to the cul-de-sac!" This is actually seen in a flashback. However, at the beginning, the unsub receives the signal while sitting in the car with his daughter. He then leaves the car to go back into his house. The B.A.U. and local law enforcement arrives later and arrests him inside his house, leading him out in cuffs. In other words, they could not have recognized the song as the signal because they weren't there to hear it.
When the father is getting ready to get out of the car, his window is rolled up. The camera then cuts to a different angle when he's getting out, and the window is rolled down. The camera then cuts back to the original angle as he closes the door, and the window is rolled up again.
There is no Bennett High School in Sarasota, Florida. However it is accepted practice for fictional television shows to invent schools rather than use real ones, particularly when the story might negatively stigmatize a real school.
There seems to be no rhyme or reason to the parking in the unsubs' cul-de-sac. At times cars are parked parallel to the curbs, other times parked nose in. This is made quite obvious when the neighborhood teens are making fun of Andrea. Her Prius is parallel parked, while an S.U.V. is nose in.
At 32:10, a sailboat with a California registration number is in the foreground, but the episode is set in Florida.