Maggie's Diner was built in Madrid, New Mexico for the film, but the producers were asked to leave the building standing when filming was complete. It is now a gift shop that sells Wild Hog and Del Fuego souvenirs.
The scene in the Del Fuego's bar, when Woody was squinting, was almost entirely improvised. The cast had done the scene a couple of times and would ad-lib occasionally. One time John Travolta just started squinting in a Clint Eastwood impression. The other characters' reactions were real. They were expecting Travolta to say his lines, but kept going with it.
Director Walt Becker praised M.C. Gainey's professionalism during the movie. In the scene where Martin Lawrence splatters Gainey with mustard and ketchup, they did many takes. A few times, some of the condiments even got into Gainey's eyes. Becker noted that Gainey was good-natured about the scene and never complained once.
At the end of the ruckus in Madrid, Damien Blade, played by Peter Fonda, tells the Wild Hogs to " Lose the watches." This may be a tribute/reference in one of the initial scenes in "Easy Rider." Peter Fonda, playing Captain America, looks at his watch at the beginning of his and Billy's (Dennis Hopper) ride to New Orleans, takes his watch off and throws it to the ground.
The movie features quick cameos by Paul Teutul, Sr. and Paul Teutul, Jr., of American Chopper: The Series (2002) fame. The two famous bike builders appear in the Wild Hogs' favorite bar, as the bar owner and a background patron.