This episode is very similar to episode 18, "Postman Panic". Many of the jokes used in this episode are either variations or the same ones from the other episode. Thus, this episode could be considered either a sequel or a remake of episode 18.
This is the second time Huck plays a mailman. It is also the second time he has to get past the white dog. The first time both these facts happened was in episode 18, "Postman Panic".
However, this episode marks the dog's third appearance. He has also appeared in episode 12, "Fireman Huck".