Things you didn't notice before in Mario games

I just now noticed that Luigi's Mansion (E ranked version) can be seen in the background of Luigi Circuit in Double Dash and the DS version of that track.
LuigiCircuit-Shortcut1-MKDD.png
MKDS_Luigi_Circuit_GCN_First_Turn.png
 
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For MP1, there's extra bonus coins awarded to the 20th, 30th and 40th person to pass start

For MP3, all boards have a faint circle were the Star Space will be when occupied. This was a feature not used in either 1 or 2 nor in ANY other game up until Mario Party Superstars over 2 decades later
 
I noticed that the music for the minigame Jewel Drop is shorter in Mario Party: The Top 100 than in Mario Party 10.

Here is the Mario Party 10 version:

And here's The Top 100's version:

The music from Mario Party: The Top 100 is half as long as Mario Party 10's, because the second half of Mario Party 10's music (0:49 - 1:27) is not in the Mario Party: The Top 100 version.

(Man, I still LOVE Mario Party 10's music. It has the best soundtrack ever)
 
I found a shortcut in dry dry ruins that no one to put in the MarioWiki(I filled it up)
Prerelease:Mario Kart Wii/Course Banners - The Cutting Room Floor

during the third lap you can mushroom though the sand and trick of that ramp and cut one more hill if done right