Carver - who replaces Sera Gamble - told that the CW drama had become "buried under its mythology".
"It became a little hard to tell exactly what was going on at times," he claimed. "The longtime fans all deserve intricate plot, but it felt a little burdensome."
Carver explained that he wants the new episodes to appeal to "lifelong" Supernatural viewers and "new fans" alike.
"Resetting our mythology was one idea that I tried to bring into [the show]," he said.
Season eight will see Sam (Jared Padalecki) and Dean (Jensen Ackles) reunite after spending a long period of time apart.
"Part of this season is realising they didn't just spend several years together; they really matured in different ways," Carver claimed. "It's one thing to get in a car with your brother in year one, but eight years later, you've both matured and grown.
"You're both changing and trying to find out who you are. There's a lot of that type of exploration for these guys this year."
Supernatural returns to The CW for season eight on October 3. In the UK, season seven airs on Wednesdays at 10pm on Sky Living.
