Arsenal is still fine, but this loss does of course have some drawbacks as a draw would have been much better as it would have kept the distance between Arsenal and Newcastle. Now Newcastle is in the middle of the competition for the top ranks again and that raises pressure for all of the teams at the top. But until mid of December Arsenal will have a few games in the Premier League that won't be as hard as the one against Newcastle.
For Liverpool this draw was a disappointment I think. Since Aston Villa and Arsenal lost their games, Liverpool had a tempting chance to create some distance. Still not much, but some distance that could also snowball later on when the teams behind fail once more and Liverpool has a streak, this can quickly grow to 6 points, which is quite comfortable. But they missed that chance.
Newcastle started the season very badly. Their performance was erratic. Many people thought Newcastle would not even finish in the top 6 of the table this season. But Newcastle coach Eddie Howe has managed to stabilize his squad. Now Newcastle's performance is quite stable and consistent. I was not surprised at all by Newcastle's win against Arsenal. Newcastle's performance was not weak, but Newcastle were very tactical.
No one would have imagined that the Luton would share points with Liverpool. Because this team was in the relegation zone and their performance was very poor in the previous matches. But Luton's performance against Liverpool was really good. And I would say they deserve 1 point from this match. Liverpool failed to win this match due to their tactical weakness.
Started the season very badly is relative. They started it with a 5-1 victory over Aston Villa and then they lost two games, one of which was away against Manchester City and the other one was indeed a game they should have won against Liverpool, but it is still Liverpool. Then came the game against Brighton, which I think was their worst game of the season, but afterwards they had seven games with five wins and two draws. In terms of results the start was bad, but it also means that they have already played against the majority of the teams from the top of the table an won against Arsenal and Aston Villa, but lost against Liverpool, Man City and Brighton. I think they will add a lot of points in the next games.