The young trio were exhilarating in a crushing 4-1 victory at Selhurst Park.
"I don't think it has come together like that since our first game together," Mount told the club's website about Pulisic and Havertz.
"It was always coming; it was always brewing. We started off very sharp. At the top of the pitch our combinations were good, we were creating chances and we took them. That's something we probably haven't been doing as much recently.
"We know we have a lot of quality in the team. When we're on it and we're creating chances we can score a lot of goals. It hadn't happened like that but it has now and that's great for us.
"We came into the game with a lot of confidence after Porto knowing what we can do. As a team we felt very strong. We know what is on the line. We're still in three competitions so every game is so important."
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