When Olivia (as Nick Lane) is in the bedroom with Ginger, the club dancer, she observes her in the bathroom topless. Seconds later, Olivia enters the bathroom, and the dancer is now wearing a bra.
After talking to the woman who killed her own husband, Olivia walks away. As she turns the corner, she has her hand on her head. Peter comes in behind her and she is lowering her hand, but when she turns around to face him she has her hand back on her head, about to lower it.
The train station in New York City is identified in the floating caption as "Grand Central Station"; which is both a common name for the train station that is officially named Grand Central Terminal, as well as the official name for a United States Post office on 450 Lexington Avenue in New York. There is also the Grand Central-42nd street Subway Station next door to the terminal.
According to his card; Nick Lane was admitted to St Jude's Mental Hospital 3.28.79, which was before his birth 10.12.79,.
About halfway through the episode, Olivia and her team enter the home of the suspected serial killer. When she examines a wall covered with photos and articles, she focuses on an article titles "Genetically Modified Children, The Future of the Super Human Race". If you pause the video and read the text of the article, you'll find that it is actually about risks associated with people tracing others cell phone numbers. Either this is meant to be a mistake in the printing of the newspaper, or more likely, the prop department pasted the headline on some arbitrarily-chosen newspaper clipping, assuming that no one would read the text of the article.
The car's roof implodes and the windows shatter a split second before the falling woman hits it.
When Olivia helps mouse kill her husband in her dream, it's clearly a theater knife they use to stab him.
When they enter Nick Lane's apartment and begin to clear, Olivia walks past a closet without opening it, but states the room is clear. Also, when she states the bedroom is clear, she didn't open the other closet to make sure the room was actually clear.
Astrid explains to Walter that the word Unsub is a contraction of "Unidentified Subject", it is actually a contraction of "Unknown Subject". The distinction is important as an unsub is the focus of an investigation and as such is not unidentified, but is unknown.