After Netflixing seasons 1 & 2 (yes i got the gold box edition), I had to wait months for FMMW to be available. By then, some of the small details were forgotten. Was Jeffries (Bowie) ever mentioned at all in the series? He came in to the show as if we were supposed to know him...perhaps Dale causally mentioned an agent went missing?

He wasn't... But Sam Stanley was mentioned in the Pilot...

He wasn't... But Sam Stanley was mentioned in the Pilot...

 please remind me who he is again?

Irene asking " who's the toehead" In tp fwwm. actor kiefer sutherland, character agent sam stanley, from tp fwwm. he asked for prices on the furniture in tp fwwm dear meadow. also noticed teresea banks dead body finger  nail in that film.

Yes... Coop says in the Pilot: "Diane, give this to Albert and his team, don't go to Sam". Well, it isn't 100 % definitive that he's referring to the same Sam, but who else can he be? I think that they created Kiefer Sutherland's character from that mention and that's why they made him the way he is. Lynch took some elements from the Pilot and expanded them in FWWM, like Sam, Bobby killing someone, etc.