- Actor Allusion
- A retroactive example - when Bobby D is Put on a Bus in season 3, it's explained that he's on a task force in Chicago. Todd Williams subsequently took a role on The Chicago Code.
- Inverted: In 2x03, "A Stand-Up Triple," the very non-maternal Mary asks Stan and Marshall to shoot her in the head if she ever has three kids. Two years later, the actress was pregnant with her third child.
- Marshall once tried to quell an argument by telling the two "Wherever you go, there you are." The saying was (somewhat) popularized by The Adventures of Buckaroo Banzai Across the 8th Dimension when said by Peter Weller's character (the titular Buckaroo Banzai). Marshall is played by Peter Weller's cousin, Frederick Weller.
- The Danza: Mary Shannon, played by Mary McCormack. Incidentally, the alias the character uses is "Mary Shepherd".
- And in season 3, Allison Janney plays new WitSec director Allison Pearson, and Raph's aunt Rita Molena is played by Rita Moreno.
Trivia / In Plain Sight