The former Bolton Wanderers shot-stopper came in to the starting XI at Vicarage Road after regular number one Simon Mignolet was ruled out with injury.
The Reds have long had a problem with their goalkeepers as Mignolet is not exactly infallible, committing a succession of errors himself and prompting plenty of debate among supporters.
It was a rare chance of Bogdan nonetheless, and it is a game he will instantly want to forget as his gaffe in the opening stages of the match handed Watford the initiative.
Speaking to reporters after the match, the goalkeeper made no qualms over who was culpable.
“It was a wrong time to concede," he said. "I dropped the first ball which is a mistake, I hold my hands up, but I felt I recovered the ball and he kicked it out of my hands. But if I catch the first one it's not a goal.
“It was a mistake and I will learn from it. I felt good, it wasn't nerves. I trained hard for this chance and it started as a nightmare. I don't blame the referee or anyone else, I go back to train and work hard."
The goal was rather contentious as after Bodgan dropped the initial cross, he did seem to have two hands on the ball before Ake poked it from his grasp and into the net.
It gave the hosts something to build upon, and they soon doubled their advantage as Odion Ighalo took advantage of some slack defending from Martin Skrtel to fire home after 16 minutes.
Things never really got much better for Liverpool as despite a sustained period of possession they never really troubled the Watford back-four and a comeback was not on the cards.
The Hornets sealed the win when Ighalo grabbed his second of the match five minutes from time, prompting a subdued reaction from boss Jurgen Klopp as the German now seeks an instant reply.