The First Order sentry droid appears in the background of both Star Wars: Episode VII - The Force Awakens (2015) and Star Wars: Episode VIII - The Last Jedi (2017) and it's fold out weapons were first revealed in Star Wars: Battlefront II (2017) although they were actually designed for this story.
General Leia Organa is wearing the same ring as in Star Wars: Episode VII - The Force Awakens (2015) and Star Wars: Episode VIII - The Last Jedi (2017) and here sports a hair clip with the same design.
When Poe uses his X-Wing scanners to search for any life-sign readings of Kaz in the asteroid debris, his instruments make the same sound heard in Zev Senesca's Snowspeeder as he searches for Luke Skywalker and Han Solo in Star Wars: Episode V - The Empire Strikes Back (1980).
The computer screens on the Fireball dashboard feature the typeface seen on the Trade Federation computers in Star Wars: Episode I - The Phantom Menace (1999). The lettering translates to 'System Warning'.
The mineral that was mined on Station Theta Black, Dedlanite, first appeared 2015 Marvel Comics mini-series 'Chewbacca', in the beetle caverns of Andelm IV.