A different actor plays Sharona's ex-husband. David Lee Russek replaced Frank John Hughes (Season 2 Ep 7).
The 19th century map of West Virginia that Monk calls out as fake from "Mr. Monk Gets Married (2004)" makes an appearance around the 29 minute mark.
Gail is supposedly Sharona's younger sister, but Amy Sedaris is eight years older than Bitty Schram.
Emma Caulfield Ford appears as Meridith alongside Stanley Kamel. Both made an appearance in season six of Beverly Hills, 90210 (1990), Emma as Susan Keats and Stanley as Tony Marchette.