The riff: Noted by Mike immediately as the crew enters the theater and the short’s title card is shown.
The explanation: He’s referring to the tagline and fashion choice of Century 21 Real Estate agents, who wear gold jackets as part of their uniform. The company’s motto is “the gold standard,” and the jackets have been part of their brand identity for quite a while as far as I can tell. They’ve even done whole series of commercials built around the gold jacket image.
Novelty factor: This may be commonly held knowledge, but it wasn’t commonly held by me. Perhaps that has something to do with the fact that I’ve never been in the market for real estate. Honestly? I was expecting some kind of song lyric.