Singing cowboy Ray Whitley (Tim's sidekick, Smokey) is famous for writing Gene Autry's signature song, 'Back in the Saddle' again. According to Hollywood lore, Whitely received a phone call from RKO one morning asking him to write a song for a movie he'd be appearing in later that same day. He wrote the song in just a few minutes and performed it in the film that afternoon. Soon after that, Gene Autry heard it and used it in his next movie. It became Autry's theme song from then on.
Before joining the U.S. Army Air Force and serving as a B-29 bombardier in the Pacific, Tim Holt made over a dozen westerns. The studio experimented with different comic sidekicks, with Cliff Edwards "Ukulele Ike" in almost half of them. However, in Come on Danger he actually has two sidekicks, singing cowboy Ray Whitley and old timer Lee 'Lasses' White, who played Smokey and Whopper, respectively.
A four-minute-long scene near the end of Come on Danger is an exact copy - line for line and shot for shot - of a scene in George O'Brien's The Renegade Ranger (1938). Watch for the scenes at the 50-minute mark in both movies. It begins with the hero and two sidekicks listening outside a window as the villain discusses murdering the heroine, followed by a fight in which the villains' cook comes out of the kitchen and disrupts the fight by cutting the rope which holds up a suspended wagon-wheel chandelier. In Come on Danger the hero is Tim Holt and his sidekicks are Ray Whitley and Lee 'Lasses' White. In The Renegade Ranger the hero is George O'Brien and his sidekicks are Ray Whitley (again) - and none other than Tim Holt. In both versions, Tim Holt pretends to be injured and staggers past two guards, then he falls over while his two companions jump the distracted guards.
The attractive heroine in Come on Danger is Frances E. Neal, who became the third wife of Van Heflin on May 16, 1942, less than three weeks before the release date of this film on June 5, 1942.