0:40:47 - Some text on the right reads "egadd" (reference the character Professor E. Gadd). There's also some dates and other text which could be referencing something.
Some easter eggs I noticed in the Super Mario Galaxy Movie that aren't on the Super Mario Wiki's list:
0:16:49 - Zora from Zelda series (also in the first movie)
0:32:05 - Zelda NES boxart
0:32:49 - Mario Kart 8 trophies
@MaritheKity I agree with your point, but the Ordertune CD was probably a special case because there were some accusations of plagiarism in one of the boss tracks so they might've not given specific credits to avoid the composer getting harassed.