Takeaways from Bills' comeback win vs. Dolphins, clinching AFC's No. 2 seed

Rocking a pedestrian 6-6 record not too long ago, the Buffalo Bills aren't only going to the postseason, they're the No. 2 seed in the AFC. 

In the season's final "Sunday Night Football" matchup, the Bills came from behind to knock off the Miami Dolphins, 21-14, clinching a fourth consecutive AFC East title and the second spot in the conference bracket. Here are three takeaways from the Bills' thrilling season finale victory: 

Don't call it a comeback: Early on against the Dolphins, it didn't look like it would be the Bills' night. Quarterback Josh Allen struggled, especially throwing two interceptions in the end zone and one ball short of the goal line as time expired before halftime. 

However, with Buffalo trailing 14-7 at the break, he bounced back in a big way, going 14-of-15 for 141 yards and a touchdown while rushing for 41 of his 67 ground yards in the second half. 

"I was beating us," Allen said via Matt Parrino of syracuse.com. "But we're a resilient group and kept working hard." 

Thanks to Allen and a defense that picked off QB Tua Tagovailoa twice while holding him to only 167 yards passing (6.0 YPC), the Bills' wild-card opponent will be the Pittsburgh Steelers, who barely snuck into the postseason and will likely start Mason Rudolph at QB. 

Dolphins' late collapse may lead to early playoff exit: Once the overwhelming favorite to grab the No. 1 seed in the AFC, things aren't looking great for the Dolphins. With Sunday's loss, they've lost two in a row and three of five to close out the season, blowing a three-game lead in the AFC East in the process. 

With the two-seed on the line, the Dolphins played sloppy football and looked the part of a team destined for a first-round playoff exit. Despite closing out the first half with scores on back-to-back possessions, the offense was largely lifeless, posting four punts and an interception over five series in the second half. 

Now, instead of a home playoff game against the Bills, the Dolphins must travel to Arrowhead to face off against Patrick Mahomes and the Kansas City Chiefs. 

Late-game clock snafu could've been a game-changer: While it may have had no impact on the result, a potential mistake by officials late short-changed the Dolphins. 

With 3:12 left in the fourth quarter and the Bills attempting to run the clock out nursing a seven-point lead, Allen scrambled loose for a 15-yard gain on third-and-13. However, the clock continued to run despite the QB's hand going out of bounds while he braced himself for a tackle. 

Miami did have one timeout remaining but chose to hold onto it with the two-minute warning approaching. Nevertheless, the goof cost the Dolphins precious seconds they could've used on a final offensive drive that resulted in a rushed interception from QB Tua Tagovailoa.