Continuity mistake: When the Wild Hogs first go to the Delfuego Bar, it is a bright sunny day and the ground is completely dry. When Woody had to go back and recover Dudley's bike the ground is completely wet, but when Woody is riding Dudley's bike back to the other Wild Hogs, the ground is again dry.
Factual error: At the 28 minute mark, the Wild Hogs cross the Taos River Gorge Bridge in Taos, New Mexico. Shortly after the scene with the skinny dipping, they drive down the road and at the 34 minute mark, the sign on the right says, 'Missouri State Lane.' I never knew Missouri was inside the state of New Mexico.
Audio problem: When Damien Blade shows up at the end, he shows up on a motorcycle close to the crowd, right on the main road, yet there's no sounds of a motorcycle pulling up before hand. They would definitely have noticed him pull up and hear his motorcycle coming in way before he stepped off the bike and the crowd parted way.
Continuity mistake: When the biker bar blows up, you get to see an orange blossom explosion behind Woody as he rides away, which then dissipates into a black cloud. Camera now cuts immediately to one of the side mirrors on Woody's bike and the explosion is now orange again.
Plot hole: When they are swimming and before the family shows up, the Wild Hogs throw all their clothes on to the side of the pool. When the family gets in and they get caught, the mom seems to see the clothes from across the pool but she is looking the opposite way of where the clothes should be.