Because the budgets of RKO "B" movies had risen from $140,000-$150,000 to the $175,000-$200,000 range, RKO boss Sid Rogell experimented with shooting a movie at Churubusco Studios in Mexico City since RKO had a half interest in it. However, he found that the modest savings from shooting there weren't worth the effort.
On the plane, Victoria is holding a copy of the novel "Bell Timson" by Marguerite Steen, published by Doubleday & Co. in 1946, with its original dust jacket.
The plane depicted as taking Steve and Victoria to Mexico City is an American Airlines DC-6A.
Carlos' taxicab is a 1942 Dodge Custom. Steve rents a 1946 Dodge Custom convertible for his drive with Victoria.
The $200,000 for the stolen necklace equates to about $2.35M in 2021.