The platter Quark uses to serve hasperat on is shaped like the Starfleet insignia.
The sequence with Shakaar's ship docking Deep Space 9 was a re-use of the Wadi starship that first appeared in "Move Along Home".
Duncan Regehr (Shakaar) also played the role of Ronin in the TNG episode Sub Rosa.
This episode is Duncan Regehr's second of three appearances as Shakaar Edon. He had previously appeared in the third season episode "Shakaar".
Kira and Odo discuss the belt that regular universe Odo first started wearing at the beginning of season 3 that he suddenly stops wearing in the season 3 episode Civil Defense (1994).