Worf's rage at Geordi's awful mandolin playing slowly boils, he finally grabs the instrument from Geordi, smashes it on a tree, hands the remains back to Geordi and says, deadpan, "Sorry". Direct homage to the Bluto / Stephen Bishop scene at the toga party.
Robin Hood, while dueling with Sir Guy, says "There's something you should know. I am NOT from Nottingham!"
Vash reappears, so there are some references made on how Vash and Picard met - which happened in "Captain's Holiday"
Vash reappears, followed by Q. The two left together in "Qpid". O'Brien also tells Sisko what happened in "Qpid" after he saw Q on DS9.
several key scenes spoofed