The station was also heard during the credits in episode 2. So far I have not heard enough of the station to actually say it is a numbers station, but there is definitely something repeated and static filled that could be numbers.
I did see a timeline faux pas in episode 3, "The Hive".
In one scene of that episode a character is listening to a record. The record player is part of a console type radio, there were many such made in the right time period, the show is set in 1943. The room is dark and there is a close-up of the radio dial as the character reaches for it and turns the volume down. The dial is, as normal for these radios, backlit. The dial is very clearly the center of focus in the scene.
It is a dual band console radio / phonograph. The top band numbers are 88 to 108, the FM broadcast band. The bottom band numbers are 55 to 170, or 550 to 1700 kHz, the AM broadcast band.
However, the 88 to 108 MHz FM broadcast band did not exist until near the end of 1945, 2 years after the time of the show, in 1943 the FM band was 42 to 50 MHz, and the radio used in the scene is a 1947 or 1948 model.
T!