To clarify to those who may be confused: the easter egg is the three figures that look at you from atop the cliffs. Notice how I wave the cursor in a circular fashion when you see them.
In Shiverburn Galaxy, there are two missions that have these anomalies, "Prince Pikante's Peppery Mood" and "Octo-Army Icy Rainbow Romp". In these two missions if you look up at the glacier cliffs, you can spot three figures watching Mario. I absolutely have no idea what these are, and why they do this, but this is an "easter egg", or something that's there for no reason, like colored eggs with candy during Easter found in your attic. You can spot these only in first-person view, and because of the fact the time if takes for first-person view to load up and close, you can't actually see them walking and following you.
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We all know Shiverburn Galaxy in Super Mario Galaxy 2 right? Well if you haven't played it...