This is a just an observation. I am not knocking Google nor am I complaining in any way.
Let me reiterate; it is just an observation.
I am in the process of "trying" to make my own custom boot animation for my Nexus 5 and was thinking of trying to get the boot animation colors to merges into the X of the Nexus 5 logo before it fades in and then play with some other ideas.
In doing so I realized that in the Nexus 5 boot animation, the yellow and green are reversed in relation to the Nexus 5 logo.
On the Nexus 5 logo, from the top left and clockwise, it is: blue, red, green, yellow.
In the boot animation the colors are in the order: blue, red, yellow, green.