A disappointing result and in this season you cannot afford to drop any points. Liverpool could have went three points clear at the top, albeit very early on in the season, but a defensive performance which mirrored the start of Klopp's reign prevented that from happening.
So what did we learn?
1) Curtis Jones has a big future
Let's start with the positives. Curtis Jones, who for some reason has been fiercely debated recently, proved his worth to the team. He was handed his first Premier League start of the season after impressing in recent substitute appearances and he also showed quality against Norwich City.
He was probably the man of the match against Brentford scoring a thunderous strike to give Liverpool the lead which they could not hold onto.
He was disciplined in the first half and came close to scoring then as well as he hit the post. The biggest compliment you can give him is that Liverpool lost complete control of the game when he left the field.
At just 20-years-old it is hard to see how Jones does not go onto big things at Liverpool.
2) Diogo Jota is a serious aerial threat
It is probably something we already know but the fact he scored another goal with his head is just further proving how deadly he is in the air.
At just five foot ten he really should not be the target man when crosses are getting flung into the box but he is.
It was a lovely delicate header from Jordan Henderson's cross and he is definitely the first choice striker over Roberto Firmino these days with the Brazilian failing to have an impact when he came on even though he has just came back from injury.
3) Jurgen Klopp's in game management can be questioned
After going 3-2 up in an end-to-end game you would expect manager Jurgen Klopp to do what he so often does, bring on the trustworthy James Milner to help close out the game as he is so good at it.
However he took off Curtis Jones for Roberto Firmino whilst Sadio Mane, Diogo Jota and Mohamed Salah were still on the pitch.
It left the midfield wide open which meant that there was always an open pathway for Brentford to get at the defence which at times was just Joel Matip and Virgil Van Dijk due to how high forward the full-backs are. It was a really poor substitution and in hindsight definitely the wrong decision.
4) More care is needed when trying to create opportunities
Crossing is one of Liverpool's most potent weapons and it works wonderfully, however against Brentford it was not great, especially from the full-backs.
Unfortunately it was probably Andy Robertson and Trent Alexander-Arnold's worst game as a pairing as they were torn inside and out at the back whilst also not creating too many chances.
There was too many times when a ball would just be crossed into the box into no one or just drilled into the first man, even from corners which have been Liverpool's biggest threat this season.
Out of 12 crosses Alexander-Arnold completed just two. Out of seven crosses Robertson completed just two. Which emphasises the point.
5) Sadio Mane's decision making needs to be back to what it was
A couple of season ago Sadio Mane was one of the best players in the world. Last season he had a dip in form which is understandable after non-stop football and also the fact that the game was lifeless last campaign.
He looked like he may be back to his best in the first couple of games. Even though he has scored three goals this season he has had some average performances and against Brentford it may have been his most passive game of his Liverpool career.
He did not have a shot on target and only created one big chance whilst not successfully dribbling past anyone. His decision making was also poor as he took too long on the ball at times and it affected Liverpool's attacking rhythm.
Everyone knows there is one hell of a player in there and the sooner Mane can get back to his consistent self the better for Liverpool.