William Nigh, who directed this and the other four films in Monogram Pictures' Mr. Wong series, was a prolific director of B movies, with more than 200 titles in his IMDb filmography. Before turning to directing, Nigh had been an actor, whose credits include being one of the original Keystone Kops in silent comedies for Mack Sennett.
The radio with the remote control is a Philco model 40-205RX with the "Mystery Control" wireless remote. The rotary dial on the remote selected one of eight preset stations, turn the volume up or down and turn the radio off (but not on). 5,050 of this model were manufactured and it sold for $159.50 (which would equate to $2,744 in 2016).
Filming began November 28 1939, the fourth of the six-film series, which Boris Karloff quickly followed with Black Friday (1940).
The "remote controlled radio" was real technology, the Philco Mystery Control, introduced in 1939.
This film can be found on many multi-film horror collections on DVD because of its star, Boris Karloff.