Firefly (2002)

Out of Gas - S1-E5

Trivia: Wash sets up a big red button for Mal to push to call back the shuttles if help arrives. He tells him "When your miracle gets here, just hit this button". After the show got cancelled, Alan Tudyk sent the button to Joss Whedon with the same message enclosed.

The Message - S1-E15

Trivia: The scene where Kaylee is in the engine room listening to Tracy's message again, on the work bench next to her hammock you can see a small figure of Han Solo frozen in carbonite from "Star Wars".

Ariel - S1-E8

Trivia: When the crew returns from their raid of the Alliance hospital, Malcolm grabs Kaylee from behind and holds her in a friendly hug. This was improvised by Nathan Fillion, and was left in the shot because Joss Whedon felt it was such a natural movement for Malcolm to make. (00:37:00)

Cubs Fan

Trash - S1-E14

Trivia: As Mal is bringing the shuttle in to land at the floating luxury home, as he flies to the left of a tower towards the gardens, behind them flying from right to left is the unmistakable silhouette of an SR-71 Blackbird cruising by. Given that this is a planet for the super rich and the heist is of a well known collector of old Earth artifacts, maybe this plane is part of another collector's collection, like John Travolta and his small fleet of planes including an airliner and other exotic aircraft.

Serenity (1) - S1-E11

Trivia: In the first scene when Mal is firing at the plane with the enemy's turret gun, if you look at the top center of the gun's display, you can see the Weyland-Yutani logo from the Alien films.

Brad

Serenity (1) - S1-E11

Trivia: According to Joss Whedon and Nathan Fillion in the DVD audio commentary, Whedon had originally written the role of Badger for himself.

Cubs Fan