This video shows how to get two unused cutscenes in one go. It is not necessary to enter DK Bonus / Bosses after every Intro Story scene.
Since Intro Story fadeouts always try to access a cutscene number, the corresponding cutscene will play on the menu after you get kicked out.
0:57 scene 2: cutscene 0 (nothing happening)
1:27 scene 3: cutscene 0 (nothing happening)
2:37 scene 4: cutscene 1 (Rambi chasing beavers)
3:02 scene 5: cutscene 7 (unused cutscene: a kremling walking in mid-air)
3:27 scene 6: cutscene 8 (unused cutscene: colorful sparkles)
4:27 scene 7: cutscene 0 (nothing happening)
Entering a file takes you back to main menu mode. This also allows you to enter DK Bonus / Bosses and get another fadeout.