Mangini lamented Cleveland five turnovers, including two fumbles -- one by rookie wide receiver Mohamed Massaquoi, the other by tight end Steve Heiden -- following completions by Anderson that sabotaged potential scoring chances. Mangini felt the Browns were moving the ball and Anderson can't be judged solely on his atrocious statistics.
"You never just want to look at the numbers, Cleveland you want to always look at it in the context of the game," Mangini said.
Anderson's numbers are impossible to ignore.
According to STATS LLC,Cleveland his 36.2 QB rating is the lowest of any player through eight weeks since Oakland's Marc Wilson in 1981. Also, Anderson's 320 yards passing in the past four games are the fewest by any quarterback with a minimum of 80 attempts since Chicago's Vince Evans in '81.
Anderson, meanwhile, said he's "not happy about anything."
"I'm not happy that I got pulled out, I'm not happy we lost, I'm not happy about anybody's play, my play, nothing," he said. "I haven't been happy."
Mangini, too, is dismayed by the losing but remains Cleveland confident the Browns will improve.
"This is a process," Mangini said. "We [Mangini and Lerner] talked about that quite a bit, and that doesn't change. There's things that go along with that and that doesn't mean we're not looking to win every game, it doesn't mean we're not looking to improve each week. On the contrary, that's exactly what we're going to do.
"Randy and I share the same vision and that's something that we talked about and what we do talk about quite a bit is what's the best way to achieve that. I've always had good conversations with him and always will."
Mangini said he shared Lerner's Cleveland distaste for the Browns' putrid performance so far.
"But I also believe in the things that we're doing and I understand it doesn't happen overnight," he said. "There's not one formula in terms of specific ingredients, but there is a very specific approach that you have to take and I believe in that. It has been successful. It will be successful here."
Chris Mortensen is ESPN's senior NFL analyst. Adam Schefter is an ESPN NFL Insider. Information from The Associated Press was used in this report.