Barney was using a telephone pickup coil made by Sanyo to listen to the safe's tumblers. This was an included accessory which was included with the Craig 212 tape recorder used for mission briefings. The Craig 212 was made by Sanyo and was sold under the Sanyo brand name in other countries.
Rodolfo Acosta's (Presidente Miguel De Varo) first role after leaving The High Chaparral (1967), where he played Vaquero for two seasons.