Utkarsh Ambudkar has participated in actual play D&D shows. In Force Grey, he played the character "Hitch" in celebrity D&D games with other celebrity players like Deborah Ann Woll, Joe Manganiello, Dylan Sprouse, Brian Posehn, and Matthew Mercer. Apparently, he's playing "Hitch" in the show's game as well. He also guest-starred as Bor'dor Dotson in Critical Role's 3rd campaign.
Hetty and Thorfinn do not appear in this episode.
Baxter, the fife player British Soldier looks to have a bayonet sticking out of his chest. Ouch.
John Hartman (Nigel) and Brandon Scott Jones (Isaac) both had reoccurring roles in The Good Place (2016) though they didn't appear in the same seasons.
Since early November of 2022 the US series of Ghosts began showing in the UK on BBC3 and streaming on BBC iPlayer. It has received some mixed reviews, particularly from fans of the original, but the public reaction seems generally positive and John Hartman's British accent here is very interesting.