"I feel well - good not great - because I saw the team fight and have character," Pochettino said. "It wasn't a great game but I think we did enough to score and maybe win the game.
"I am happy with the way the team showed character so it means that the only way we improve is to work hard."
"You could see exactly what happened there. I completely believed it was a penalty," Watford manager Quique Sanchez Flores told BBC Sport after the game.
Flores felt the goal should have been disallowed for a Harry Kane shove on Christian Kabasele in the build-up.
"I believe it is a foul. He pushed with both hands but that is my opinion," said Flores. "It is a little bit different. I don't think they need VAR."