DPS-CGK new B737-900. The aircraft condition although it is brand new but dirty many spots on the leather seat trash on the carpet which shows that they do not clean it properly. FA only did the safety demonstration do the snack & drinks selling and the rest of the flight they chit chat on the pantry. Some of the FA announcement are recorded. Another things some passengers are still doing some activity while the fasten seat belt sign is on and the FA did not warn the passenger to go back to their seat. I believe that Lion Air should upgrade their services and FA skills/knowledge.