The Dorian launch bay showed in the beginning was actually the old set for the Battlestar Galactica Viper launch bays (Another Glen Larson show) the triangle shaped hatchways with the notches for the Viper wings are plainly visible in several shots.
Koldar appears to be the same age as his son (and all the other Dorian males). Apparently, the fact that they are all identical is not just superficial.
It's never really explained why all the Dorians have the same faces. Koldar mentions a mutancy but that doesn't really explain why they would have the same face since by definition, mutations cause differences. Furthermore, we only see the men; no other female Dorians were present in the episode, although it can be assumed that they all share a face as well.
Nitpick: In the passenger cabin, the door to the hallway that leads to the rest of the Searcher is in the same wall, albeit a few feet ahead, as the door to the docking port. This is an awfully awkward, if not physically impossible design.
Except for the season premieres, cliffhangers (the first half of two-parters), and this episode, every single episode ended in the same way: a happy ending (everything working out), a group hanging out together, someone making a joke which causes everyone to laugh, and Buck in the final freeze-frame (often a close up).