Based on her wardrobe and scene blocking to hide it, Rose McIver appears to be pregnant during this season (such as being seated at the kitchen table in the kitchen scene, or behind the Front Desk when Jay comes home). She announced her pregnancy 3 months earlier at the 2024 Golden Globes, a month after shooting began for Season 3. According to US Weekly, showrunners Joe Port and Joe Wiseman have decided not to integrate her pregnancy into the show, they aren't ready for Sam and Jay to have a baby at this time.
The ghost couple that Pete meets in the store are named Mike and Gloria, which were the names of married characters from All in the Family.
Irene White plays a ghost who is permanently in Deal Mart, a clear reference to Costco. She also appeared in 44 episodes of Superstore (2015), where she was an employee at the titular store Cloud 9, also a clear reference to Costco.