Arnoid the Annihilator claims that Roger did not pay for the whistle, which he obtained in the previous game Space Quest, Chapter Two: Vohaul's Revenge (1987). However, in the order form which Roger mailed to receive the whistle it was written "Free Labion Terror Beast Mating Whistle".
In the end of the previous game Space Quest, Chapter Two: Vohaul's Revenge (1987), Roger wore purple boots when he entered the escape pod. In the beginning of this game, as soon as Roger exits the pod, his boots are black.
When Roger is disguised as the Scumsoft janitor, if he walks out of the office onto the platform and sees the Aluminum Mallard, he is shown wearing his former suit.
Arnoid the Annihilator refers to the Labion Terror Beast, whom Roger encountered in the previous game Space Quest, Chapter Two: Vohaul's Revenge (1987), as "Labionian Terror Beast".