When speaking to Reid, Morgan referred to Gideon as a "unit chief" when, in fact, Hotch is the unit chief and Gideon reports to him.
In the first unsub's home, Gideon found the book Journal of Applied Psychology written by Special Agent Jason Donovan. Jason Donovan was Jason Gideon's name until it was changed after the series was picked up.
Richard Slessman tells Gideon there is only a 7% success rate of CPR working outside of the hospital. Actually, it ranges anywhere from 2% to 30%, depending on the situation, and there is also only a 6% to 15% chance of CPR working in the hospital.
When Reid and Morgan are trying to figure out the laptop password, Reid opens the CD tray. The Metallica CD inside is called Some Kind Of Monster, which is an EP of live performances. Reid then guesses that the password is "Enter Sandman" after reading the back of the empty CD case. However, that song does not appear on that particular CD ("Enter Sandman" appears on Metallica's self-titled album, AKA "The Black Album," unofficially).
It is revealed in this episode that SSA Aaron Hotchner had worked in the Seattle office for two years.
In this episode, it is revealed that Dr. Spencer Reid can read 20,000 words a minute, has three PhDs, and has an IQ of 187.
In the beginning of episode when Reid and Hotch are in the dorm, Reid pronounces Matthew's last name as Rowling. However, about 5 minutes later when the whole team is talking to each other it is pronounced similar to Rolling.
Reid controls the play, pause, rewind and zoom-in buttons with the return button.
When he was near the elevator at the end of this episode, Hotchner was shown from behind reaching for his gun in his holster on his right side with his right hand. However, Hotchner (as is Thomas Gibson) is left-handed.
The Bradshaw College in Tempe, Arizona, part of the episode location, is actually the California State University Northridge campus.
In the end scene with the Footpath Killer and Gideon, Gideon provokes him into stuttering. The Footpath Killer racks his shotgun, yet he'd already done that when he first confronted Gideon outside the convenience store before he had fired a shot. A shotgun must be fired before it can be reracked.
A crowbar is used to break into David Walker's garage, where his wife says he spends most of his time. However, when Elle was walking up the driveway to talk to him there earlier, he drove his car right through the garage doors to escape. There should have been a gaping hole and they could have just walked right through it.
When Reid is holding the Redskins tickets, sometimes the front of the tickets are visible from his perspective and they appear blank at other times.
During the scene before the credits, the team presents Reid with a birthday cake with trick candles. They mention it's Reid's 24th birthday in the accompanying dialogue.
It is revealed in this episode that obsessional crimes are Morgan's specialty.
When listening to the unsub's call, the word "PAIR" appears on Reid's computer screen before the unsub says it.
This was the first episode in which someone other than Gideon presented the voiceover quotation.
It is revealed that Hotch was part of SWAT.
It would have been very difficult for Reid to have fired the shot that hit Phillip Dowd straight through the head because Reid was lying on the ground and the unsub was standing up.
When Hotch asks Reid if he can see the trunk of the sniper car, Reid replies that he can see it. Then Hotch asks if he could see it pop right after it pops open, and Reid says he didn't see that. How could he have known if the trunk had popped if he couldn't see it.