There's no foul play going on in the GIF that "tricks" you into seeing the colors. It doesn't throw up a colored picture right at the change and the slowly fade into a black and white image. It is, what it is... a trick on the mind and/or eye.
It doesn't necessarily have anything to do with the dot either, it's all about focus. You can focus on the door of the building if that's what you want. The trick is caused by the miscolored version of the image. You see those colors and then when the change happens, you process those colors along with the new image, which gives the appearance of regular color.
If you want, find a GIF extractor. You'll find that all it is, is the two pictures in question, and some progress bar frames. The Gifs only purpose is to allow you to stare at the one image, and then it changes to the other. Bring the 'colored' one up in the Windows Picture Viewer thing... or whatever you wanna use, and then use the Next/Previous button to switch to the black and white version. Unless there's an interruption in the transition (such as a length of white space while it loads the other) then you should see the exact same effect.
Oh... and nice cover too.