Garvey now has seven tries in 10 games this season and Hill was full of praise for his speedster.
"Marcel was on fire, he could have had another try at the end," said Hill "I thought he played very well, looked sharp and along with Alex Crockett were the pick of the three quarters.
"I thought Alex worked hard and when required in the second half stepped up and made a big difference.
"In the forwards I thought Aleki Lutui and Callum Black were the two outstanding players who worked hard and did very well."
Worcester now travel to London Welsh for a top of the table clash next Sunday and Hill has demanded his team show more respect for the ball to secure a crucial win in the capital.
He added: "We need to go into the second half of the Championship on top of the league table. It is a massive game for us at London Welsh and we have got to go down there and win.
"I will look at selection very carefully, I will look at a lot of things this week and we have got to put some work in. It will be an interesting week ahead.
"I have been quite good so far and put up with what I have seen, but we have got to stage when we have got to see a drastic turnaround.
"At the moment we are getting the same faults occurring time and time again. I've been relaxed with it because you learn from your faults at some stage. But at the moment we are seeing the same errors put together.
"The main problem is looking after the ball," added Hill. "I'm not sure against Nottingham how many times we kept the ball four phases - but I could probably count them on one hand.
"There was a lack of respect for the ball. It was like a hot potato as we passed it around. It is not difficult and it gives you go forward. At the moment we are throwing the ball around everywhere.
"Other teams we play against look after the ball and go through multi phases and put us under pressure.
"Basic stuff to correct but we have got to find a way of getting through the players that they have to look after the ball through multi-phases. When we do we will find some holes."