[s4e25] The Critic In The Cabernet Instant

: Under the stress of Brennan's request and an undiagnosed health issue, Booth begins to hallucinate, seeing and conversing with Stewie Griffin from Family Guy . Stewie mocks Booth's insecurities regarding the baby, appearing first on a television and later in an interrogation room.

: David Boreanaz previously made a cameo in Family Guy , and Stewie's appearance in Bones was considered a creative "exchange" between the shows. [S4E25] The Critic in the Cabernet

: During Booth's sperm analysis, the characters praise a count of 28.8 million in 3 mL; however, the average count is actually significantly higher (roughly 120 million per mL). : Under the stress of Brennan's request and

: Dr. Hodgins hands Brennan a "toupee screw" while calling it a "grommet." A grommet is actually a metal ring used to protect holes in fabric. : During Booth's sperm analysis, the characters praise

: Featuring Jeff Yagher as Sean Mortenson and Scottie Thompson as Kim Mortenson. Trivia & Errors

: Brennan's father, played by Ryan O'Neal, makes an appearance as Brennan discusses her parenting plans.