When Sylvester Dodd gives the nun his paycheck for something "fun and safe" at the end of Scorpion: Single Point of Failure (2014), the address on the check is 909 Aculeus Street, Los Angeles CA 90013. In astronomy, Aculeus (NGC 6405, also known as the "Butterfly Cluster") is an open cluster of stars in the constellation Scorpius. There is no Aculeus Street in Los Angeles.
Ari Stidham (Sylvester Dodd) was born in the community of Westlake Village, California. Westlake was used as a filming location for the 1999 movie 'American Pie', which starred Eddie Kaye Thomas (Toby Curtis) playing the character of Paul Finch.
The trivia items below may give away important plot points.
In the episode "True Colors," Walter and the team are helped by Hetty Lange, a character from NCIS: Los Angeles (2009). This crossover means that the series is set in the same universe as JAG (1995), NCIS (2003), NCIS: New Orleans (2014), Hawaii Five-0 (2010),and MacGyver (2016) due to the several crossovers between them.
The ongoing development of Walter and Paige's relationship actually happened off-camera. Elyes Gabel and Katherine McPhee were together for 2 years, broke up in 2016, and then rekindled their relationship. They broke up again during filming of season 4.
In the episode where Toby and Happy get married, Toby states he is wearing the same tuxedo he wore to his high school prom though he went stag. It's the same tuxedo he wore in the Movie American Pie as Paul Finch