If you watch the episode full-screen the dithering effect is going to potentially get blurred away. To ensure you see the dithering effect, right click on the video and set Flash's Quality setting to Low.
I didn't realize this until I was almost ready to render the episode, but during the colour comparisons you may notice that there's no purple used on-screen in the gameplay screenshots, even though it looks like there are shades of purple, especially in the caverns. Well, below is a picture of the bat from the caverns magnified to 10x resolution. As you can see, the EGA mode truly doesn't use any actual purple shades, but rather mixes red and blue together to simulate purple. I'd like to note, there are two shades of purple in the default EGA colour palette! (Well, "magenta", not purple, if you want to be picky.)
There IS actually an MCGA mode that has slight colour variations to the Tandy mode, but getting it working in DOSBox is a trip and a half and you still have to listen to that lousy PC speaker music. :P
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