Not all Creature Features are the same. This one stars Joan Crawford, and that right there is a big difference from the norm. It wasn't the only time Crawford worked in the "Psycho-biddy" (aka Hag Horror) genre. In fact, she was there at the beginning, in Whatever Happened to Baby Jane? While they weren't psycho-biddy, her last two movies were called Berserk! and Trog. Point being, Crawford gives Strait-Jacket some star power, but the end of her career stuck her in several similar pictures.
The screenplay was by Robert Bloch, who wrote the novel on which Hitchcock's Psycho was based. Beyond Crawford and Bloch, though, the key figure in Strait-Jacket was the legendary producer/director William Castle. Castle was best known for his promotional gimmicks, which he gave names to: "Emergo", "Percepto", "Illusion-O". "Percepto" was used for The Tingler, one of the stupidest movies ever (the title character was a parasite attached to human spines that emerged whenever someone was really scared). Stupid, yes, but the gimmick was classic: at some theaters, a vibrating device was placed under some seats, and when, in the movie, a Tingler escapes in a movie theater, those seats vibrated. The odd thing was, growing up and watching these movies on TV, minus the gimmicks, they were still enjoyable.
Strait-Jacket was relatively low-key in this context: audience members were given cardboard axes as they entered the theater.
As for the movie, Crawford gives her all, even managing on occasion to avoid the kind of hammy overacting you expect from a camp picture like this. She doesn't embarrass herself, and that's probably all we can ask. An uncredited Lee Majors makes his first big-screen appearance. Diane Baker is fine as Crawford's daughter. Crawford had a lot of control over the movie ... she made sure to stick a six-pack of Pepsi in one scene, and the man who plays her doctor in the film was non-actor Mitchell Cox, who was a Vice-President at Pepsi. Other than completists, I don't know that fans of Crawford need to see this, but fans of William Castle will enjoy it, if they haven't already seen it.