Here are some examples:
The Jacksonville Jaguars in 1999 beat the Bengals 41-10, then beat the Falcons 30-7, and then beat the Ravens 6-3 (but didn't cover as a 13-point favorite).
The Kansas City Chiefs in 1999 beat the Ravens 35-8, then beat the Chargers 34-0, and then lost to the Colts in Indianapolis 25-17.
The Tampa Bay Buccaneers in 2000 beat the Bears 41-0, then beat the Lions 31-10, and then lost at home to the Jets 21-17.
The Jacksonville Jaguars in 2000 beat the Browns 48-0, then beat the Cardinals 44-10, and then lost 17-14 to the Bengals in Cincinnati.
The St. Louis Rams in 2001 beat the Dolphins 42-10, then beat the Lions 35-0, and then beat the Giants at home 15-14 (but didn't cover as a 14.5 point favorite).
The Green Bay Packers in 2003 beat the Raiders 41-7, then beat the Broncos 31-3, and then beat the Seahawks in a wild card playoff game at home in overtime 33-27 (but didn't cover as a 6.5 point favorite).
The Seattle Seahawks in 2005 beat the Eagles 42-0, then beat the 49ers 41-3, and then beat the Titans in Tennessee 28-24 (but didn't cover as a 7-point favorite).
The Chicago Bears in 2006 beat the Seahawks 37-6, then beat the Bills 40-7, and then beat the Cardinals in Arizona 24-23 (but didn't cover as a 13-point favorite....."They are who we thought they were!")
The Dallas Cowboys in 2007 beat the Bears 34-10, then beat the Rams 35-7, and then beat the Bills in Buffalo 25-24 (but didn't cover as an 11-point favorite).
The Minnesota Vikings in 2009 beat the Seahawks 35-9, then beat the Bears 36-10, and then lost to the Cardinals in Arizona 30-17 (as a 3-point favorite).
The Indianapolis Colts in 2009 beat the Titans 31-9, then beat the Rams 42-6, and then beat the 49ers at home 18-14 (but didn't cover as a 13-point favorite).
The Green Bay Packers in 2009 beat the Seahawks 48-10, then beat the Cardinals 33-7, then returned to Arizona one week later for a wild card playoff game and lost 51-45 in overtime (as a 2.5-point favorite)