Cyia Batten, who plays Navaar, also played Tora Ziyal, Gul Dukat's daughter, in Indiscretion (1995) and Return to Grace (1996).
Despite being promoted to Chief Engineer with the rank of Commander, Kelby is addressed as "Lieutenant" by Trip in Engineering while giving a tour to D'Nesh. While it's possible that Trip does this out of habit - Kelby was a Lieutenant under him until recently - it's possible it is a deliberate attempt to get Kelby's attention - not to mention put him in his place - while he's distracted with the Orion girl.
This takes place in December 2154.