One of Clint Eastwood's most successful films at the box-office. So was the movie's precursor Every Which Way But Loose (1978). Both films, when adjusted for inflation into constant dollars, are still big box-office titles, this movie being ranked in the Top 200 grossing films of all-time.
The production company at first wanted to use The Wyoming Highway Patrol car and their uniforms for the movie scene when the motorcycle gang first arrives in Wyoming but the State refused. The Teton County Sheriff's office was quick to happily offer their car and uniforms for the actors for the shot.
According to the book "Clint Eastwood: Hollywood's Loner" (1992) by Michael Munn, Clint Eastwood said of fellow co-star Clyde the Orangutan: "Clyde was one of the most natural actors I ever worked with! But you had to get him on the first take because his boredom level was very limited".
Just before the scene where the Black Widows are knocked out by Clyde's "right turn", Clint refers to Clyde as Meathead. This was the same name his character Harry Callahan referred to his dog in the fourth Dirty Harry movie, Sudden Impact (1983).
The movie and its predecessor Every Which Way But Loose (1978) used the catchy "Clint and Clyde" first-name alliteration of its two main stars in its promotions and marketing. In true Hollywood style, Eastwood here received top first billing as he was the bigger star whilst the orangutan had to settle for second billing.