Matthieu Sys who plays Henry Samson here appeared in s1e12 and s1e13 of the Belgian version of the show as a different character, Hans Christiaensen.
This is mainly based on S1e11 (De nalatenschap -The Legacy) of the Belgian version of the show with the same name. Jasper's birthday is celebrated in S2e12 (Zwanenzang, deel 1 - Swansong Part 1).
The number plate on the motorbike (GY 83 RIF) has the same number plate at the motorbike featured in the UK version of Before We Die s1e5 (Episode #1.5 (2021)) except this has the GB EU badge on the top left of the number plate while the one in Before We Die is in the top left corner. Both shows are made by the same company.
Emma Naomi and Ben Miller both appeared in 3 installments of the first series of Bridgerton (Miller appeared in 8 installments).
Regular cast member Douglas Reith who plays The Dean (Wilfred) doesn't appear in this episode.