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.
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.
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.