Bushwhacked - S1-E2
Audio problem: When Zoë and Mal find the door to the cargo hold, Zoë checks to see if it's locked. Four beeping sounds can be heard as she does this, but she doesn't press any buttons. She only turns a knob on the door. The four beeping sounds are also heard before she even touches anything.
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.