Liverpool served returning manager Claudio Ranieri a baptism of fire on his Watford debut, thrashing his side 5-0 at Vicarage Road in the Premier League on Saturday.Roberto Firmino scored a hat-trick, while Sadio Mane and Mohamed Salah bagged one apiece to take the unbeaten Reds top of the table. The Hornets were second-best throughout, but showed signs of improvement after Mane fired the visitors in front off a beautiful cross from Salah.Nevertheless, the Reds were dominant all night, with Firmino doubling their advantage with the easiest of tap-ins just five minutes before half-time. The Brazilian was on target again soon after the restart before Salah produced another fine individual goal to add gloss to the scoreline.Watford once again came to life halfway through the second period, creating some good chances. They also managed to rattle the crossbar, but couldn't find a consolation goal.Firmino then capped off a five-star performance with another tap-in for his first domestic hat-trick since December 2018.Premier League@premierleagueDominant and devastating from @LFC 🔴#WATLIV6:51 AM · Oct 16, 202174081002Dominant and devastating from @LFC 🔴#WATLIV https://t.co/yEKtJ7oMdgLiverpool are cruising at the top of the table with 18 points, although Chelsea can reclaim pole position with a win over Brentford later in the day. Watford, who succumbed to their second consecutive league defeat, remain in 15th place.On that note, here are the five major talking points from the game:#5 Irresistible Salah continues to sizzle for LiverpoolSalah was unstoppable yet again.Mohamed Salah was involved in two goals on the night, scoring one and assisting one. The in-form Liverpool talisman continued his blistering run of form with two moments of exceptional quality, starting with his lay-off for Mane.He stole clear of his marker and scampered a few steps forward before crossing for the Senegalese with a sublime outside-of-the-boot cross. It nicely evaded two Watford defenders and fell perfectly for Mane to finish the job.Given how peerless he has been in front goal so far this campaign, Salah was never going to stop at that. A goal was always coming, and when it did, Liverpool fans were on their feet. He has now scored in eight consecutive games across competitions for the club.OptaJoe@OptaJoe8 – Mohamed Salah has now scored in each of his last eight games for Liverpool; the longest run of scoring in consecutive appearances for the club since Daniel Sturridge in February 2014 (8). Tear.6:15 AM · Oct 16, 20219162438 – Mohamed Salah has now scored in each of his last eight games for Liverpool; the longest run of scoring in consecutive appearances for the club since Daniel Sturridge in February 2014 (8). Tear. https://t.co/Em6qwMZvmoReminiscent of his strike against Manchester City a few weeks ago, Salah once again produced an unbelievable piece of skill.He eluded a host of yellow shirts with superb ball control before finishing into the bottom corner with his magical left foot. Salah now has seven goals for the season and six against Watford.#4 Ben Forster packs a punchForster had a tormenting evening, but managed to impress against Liverpool.The scoreline is a clear reflection of how dominant Liverpool were. But even then, without Ben Forster between the sticks, it could've been seven, eight or even more for the visitors.The 38-year-old goalkeeper showed nerves of steel against Liverpool's rampant attacking frontline. He dived into a few good saves, and kept the scoreline as low as he possibly could.With a little more help from his defence, he could've made a real claim for the best performer's award, but that was not to be. Watford now have the second-worst defensive record in the league with 15 goals conceded in eight games. At this rate, Forster's heroics alone may not be enough to keep them up.