"THE CASE OF THE LUCKY LEGS!" William Warren IS Perry Mason, and Patricia Ellis IS the girl with the Lucky Legs! From 1935.
Laurel & Hardy, Billie Gilbert, Minna Gombell and Patrica Ellis (Block-Heads, 1938)
The two girls are in the trunk because Patricia Ellis is hidden in the trunk during the course of the movie, something they done with Thelma Todd in UNACCUSTOMED AS WE ARE.