Bushwhacked - S1-E2
Revealing mistake: As Mal rolls the survivor of the derelict transport onto the floor, the survivor moves his left hand onto his chest when he is supposed to be unconscious.
Firefly (2002)
1 revealing mistake in Bushwhacked - chronological order
Starring: Alan Tudyk, Nathan Fillion, Adam Baldwin, Morena Baccarin, Gina Torres, Summer Glau, Jewel Staite
Jaynestown - S1-E4
Visible crew/equipment: When Simon poses as a buyer and gets a muddy hand print on the back of his suit, he and the gang are given a tour of the mud complex. In the first shot, the shadow of a camera can be seen on the ground in the very bottom left corner of the screen.
Mal: Now, you can luxuriate in a nice jail cell... But if your hand touches metal, I swear by my pretty floral bonnet I will end you.
More trivia for Firefly
Question: In some scenes, why do the Serenity crew members speak Chinese?
Chosen answer: One of the premises of the show is that the two major Earth societies that survived, and ultimately merged, were the Chinese and Americans. As a result the common language includes much Chinese. Clothing, signage, and building designs also have a heavy Chinese influence.