When Kreiger lists off the items on the table, he mentions (in order) a fedora, a cursed idol, and a mysterious floating cube. Each item pertains to the different coma dreams Archer had: the fedora for Dreamland, the cursed idol from Danger Island, and the mysterious floating cube from Archer 1999.
Marks the first time Archer refers to Mallory as Mom, not Mother.
Callback to earlier seasons of Archer shouting at Lana a bunch of times until she answers then saying "Daaaaanger Zone" when Lana starts yelling "Archer" a bunch of times and says "Stop touching EVERYTHING!!!"
Archer resumes leaving voice mail messages that sound like he's answered the phone.