Behrouz Shipatov (played by Emilio Janhunen Calderón), who has the Cold Fusion liquid, is said to have been Ruslan Akhmetov's second in command. Akhmetov (who was previously played by Steve Mills) was an enemy who captured and fought Jack Stone in the opening of Jack Stone: Rogue Albion (2018).
On the present card that Clank plans to leave to Julianne it says "Tomorrow never lies". It's a nod to the same words said by Clank to Julianne in the film Clank's Nemesis (2014). The first film to feature both characters.
In the second scene, Jack says "Cold words or something" to Clank. Which is the international title of Cold Words (2019). A film directed by Pauli Janhunen Calderón, who portrays the character Clank.