The controversy surrounded a third down at the Washington 46-yard line after Redskins quarterback Robert Griffin III completed a 4-yard pass to wide receiver Pierre Garcon with less than two minutes remaining in a game that the Giants won 24-17.
Head linesman Phil McKinnely "incorrectly motioned for the chain crew to advance the chains" rather than wait for a first-down signal by referee Jeff Triplette, NFL vice president of officiating Dean Blandino said.
New England quarterback Tom Brady has responded to a suggestion from a "suspicious" Houston defensive lineman Antonio Smith that the Patriots knew what was coming in the second half when they rallied past the Texans for a 34-31 victory.
"You know, truthfully, we just played a little bit better in the second half," Brady said on WEEI sports radio in Boston.
"We've kind of been through a lot of this before. I don't really think much of it, truthfully. I just kind of have moved on."
After the game, Smith said the Texans (2-10) used wrinkles on defense that were just installed during the week and not yet on film.
"Either teams are spying on us or scouting us ... I'm very suspicious," Smith told ESPN.
The New York Jets are sticking with Geno Smith at quarterback - at least that's what the rookie says he was told.
Despite being benched during Sunday's loss to the Miami Dolphins, Smith apparently will be the starter this week against the Oakland Raiders. He said he received confirmation from Jets quarterback coach David Lee.
Minnesota Vikings coach Leslie Frazier has not decided on a starting quarterback for Sunday's game against Baltimore.
Christian Ponder suffered a concussion in Sunday's victory over Chicago, but even if he is cleared to play, Frazier may start Matt Cassel, who performed well after replacing Ponder against Chicago.
The Cleveland Browns are not sure who their starting quarterback will be for Sunday's game against New England.
Quarterback Brandon Weeden was diagnosed with a concussion after playing the entire game against Jacksonville on Sunday. He was playing in place of Jason Campbell, who sat out the game after sustaining a concussion the previous week.
Offensive tackle Rashad Butler has left the Pittsburgh Steelers for personal reasons after signing with the team over the weekend.
Seattle Seahawks wide receiver Percy Harvin has been ruled out of Monday night's game against the New Orleans Saints because of lingering hip soreness.
The NFL has finalised its schedule for Week 15 and kept the Cincinnati Bengals-Pittsburgh Steelers game in its original spot on NBC's Sunday Night Football.
The Monday Night Football game in Week 15 is the Baltimore Ravens playing at the Detroit Lions.