Frank said: "I think it was an interesting game, there were a lot of situations that could have ended in more opportunities. I am very pleased we took the win in what was a tight game.
"We scored some brilliant goals, I must say that.
"It was a fantastic response and mentality from the players. I've said it before that this group are special in the way they come back. They are unique."
On the two VAR involvements, he added: "I think overall, fair enough. The first one, if there is a handball in the build up to a goal, then that is the rule. I think the second one, I think it's a 50-50 situation, I understand it could have been a soft pen.
"I think Ivan (Toney) slips and that's why. I can understand why it's overturned, I still think it's borderline if it's a clear and obvious mistake.
"The boys have put in the effort and foundation in the last three matches. We didn't have the cutting edge against Everton and Fulham, but we had it today."