1 Ishmael: Look, if you're going to take over Earth, you need to understand local customs. What do you Martians use for money?
2 Martian 1: Money?
2 Martian 2: Looking it up on the Internet...
3 Martian 2: Well, I'm not sure from this what money is, exactly...
4 Martian 2: But I don't think it's a problem. A lot of people are offering ways for us to make a lot of it, fast.

A couple of times I've forgotten that the floor in Ishmael's room is green and taken photos with a grey baseplate instead. Rather than redo the photos, I change the colour to green in my graphics editor. The magic of special effects!

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2015-12-05 Rerun commentary: I think green is a bit of an odd colour for living room (or dorm room) carpet. Especially bright grass green like this. Your room would feel like it has grass on the floor.

A quick Google image search confirms my suspicions. That just looks weird.