Features the only on-screen pairing of Joe Besser and Shemp Howard. Shemp was an original member of The Three Stooges. He left the group and was replaced by his younger brother, Curly Howard. Shemp later returned, replacing Curly, and is generally considered "the fourth stooge". Besser later replaced Shemp, and is considered "the fifth stooge".
The comment by Boots (Buddy Baer) to Grappler (Max Baer), "I'll hit you harder than Louis ever did", is a reference to boxer Joe Louis who battled both Baers in the 1930s.
The original script had a lovestruck female gorilla pursuing Lou Costello. However, the Breen Office censors that enforced the Production Code objected to any hint of the possibility of a sexual encounter--even an unwilling one--between a man and a female gorilla. The writers changed it from a female gorilla to a male one, and the Breen Office approved it, apparently they saw that man/gorilla straight relationship would involve marriage and sex, but man/gorilla same sex relationship wouldn't rise above mere friendship.
The little "mini-car" shown in the final scenes isn't a movie prop car, as some have claimed. It's a Crosley, which was a real car produced by the Crosley Motor Co. from 1939-42, discontinued during the war years, then resumed in 1946 until the company folded in 1952.
There's a scene where Joe Besser keeps running into Bud Abbott and Lou Costello's tent with an empty glass, fills it with water, then runs back out. A few seconds later he does it again, and again, until he's asked what's going on. He replies, "My tent's on fire". That actually happened to Max Baer when he was a young boy. He accidentally set his bed on fire, and, not wanting to tell his parents about it, kept running back and forth between his bedroom and the kitchen until his father stopped him and asked him what he was doing.