During the end credits, when Bob and Red are discussing the name of their bait shop, just before the scene cuts to black, Bob breaks character and starts to laugh.
When Jackie comes out of the shower after Fez dyes her hair green, there is a safety pin on her towel. As the scene continues, the safety pin disappears and reappears.
In Randy's apartment, there are a Commodore monitor, disc drive and a Vic-20 released after 1979, during which the episode is set.