The celebration also came before Mayfield later hilariously threw shade at his former coach Hue Jackson, who now works for the Bengals.
Mayfield had trimmed a 13-point deficit to two and had the Browns on the march, but C.J. Mosley tipped and picked a fourth-down pass with 62 seconds left to seal the win.
The guidance of Williams and the stellar play of Mayfield have turned things around for the Browns, who beat Baltimore 12-9 in overtime on October 7 when Jackson was their coach and Joe Flacco was the Ravens quarterback. Lamar Jackson rushed for a pair of touchdowns.
The old school marriage of a dominant defense and effective running attack has propelled the Baltimore Ravens into first place in the AFC North. It was still the biggest turnaround in team history, but failed to accomplish their goal of finishing above.500 for the first time since they went 10-6 in 2007.
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Cleveland (7-7-1) has rattled off five victories in its past six games, including the past three in a row. That gave him 27 for the season, one more than Russell Wilson and Peyton Manning, who had shared the record. Instead, the Ravens looked like they might run away with it in the first half.
Jackson ran 20 times overall.
Jackson's headfirst leap to the end zone, his hands fully extended with the ball, was ruled a touchdown on the field.
In the second half, Jackson showed off his speed for a 33-yard touchdown, but it was called back on a questionable holding penalty on tight end Maxx Williams.
The Browns went three-and-out after a Mayfield pass went off a wide-open Jarvis Landry's helmet at the Browns' 35.
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Cleveland was able to make a play before the end of halftime, forcing a Lamar Jackson fumble at the goal-line and were able to recover the loose ball.
But, the Browns had possession of the football late on and were edging ever-closer into game-winning field goal range.
ANYONE CAN DO IT: Kyle Williams lined up in the backfield, ran out to the flat, made the catch and turned up field for a nine-yard gain.
Perriman told Cleveland.com this week that Mayfield's faith in him has restored his confidence in himself.
Daryl Dragon, of ‘The Captain and Tennille,’ dead at 76
He played with Fats Domino and BB King and was a back-up keyboard player for the Beach Boys in the 1960s and early 1970s. Daryl Dragon , the cap-wearing "Captain" of easy listening duo the Captain and Tennille, died Wednesday at age 76.