Matt Sloan, who voices Darth Vader, became well known amongst Youtubers as Darth's "brother" Chad Vader in Chad Vader: Day Shift Manager.
A more serious version of Ben Solo's meeting with Ren and his knights was presented in the four part Marvel comic book series "The Rise of Kylo Ren", published December 2019 to March 2020.
When Poe's helmet spins round on his head as he crash lands on Mustafar, the Aurebesh writing is visible. As on the movie version, it translates to "Roaehal".
Despite taking place after Episode 9, Poe Dameron has gone back to wearing the same kind of jacket he wore at the start of Episode 7 and later gave away to Finn.
When Garballa is hiding in a toilet, a battle droid breaks the door with an axe and says: "Here's B-14961138815!". This is an obvious reference to Jack Nicholson's famous line "Here's Johnny!" in "The Shining".