• hāsa-kathayā — with joking conversation
  Compound: hāsa (laughter, jest) + kathā (talk). Conjugal banter. Gauḍīyas read the verse as proof that hāsya — the laughter-rasa — has its proper place inside dāmpatya, the husband-wife rasa, when both are anchored in Bhagavān.
• dharmam sevamānam — practicing religiosity
  dharma + present participle of √sev (to serve). Bhagavān doesn't merely uphold dharma intellectually; He serves it (sevā) — bows to it as one bows to a guru. The Lord's relationship to His own dharma is service, not ownership.
• artha-kāmau — economic development and sense gratification
  Dvandva: artha + kāma. Two of the four puruṣārthas. Kṛṣṇa engages both — not because He needs them, but to authorize gṛhasthas to engage them under regulation. The fourth (mokṣa) is implicit in His person.
• kadācit — at one time
  Adverb of indefinite time. The chapter uses kva api, kvacit, kadācit, kutracit — a deliberate cascade of indefinites that paint the scene as endlessly multiple. No single palace exhausts Him; in 'one time' He is always already in another time too.

• Where do I separate 'sacred' and 'ordinary' in a way that impoverishes both?
• How can my economic and family life become part of my offering?

A husband teases his wife, then performs vrata with her, then balances the accounts of the estate, then keeps the regulations of the gṛhastha-āśrama — and each room of the same house shows one face of one householder. Kṛṣṇa is teaching the whole curriculum of gṛhastha-dharma by living all of it at once.