- Mario (as well as the Babies) sticking up for a crying Luigi when the Star Gate refuses him entry (at first) merits for a heartwarming moment between the brothers.
- Luigi giving Baby Luigi (as well as Baby Mario while inside Yoob's Stomach) Yoshi cookies.
Baby Luigi: Thank you thank you thank!
- The ending, when Baby Luigi wanted to stay with his older self. Baby Mario in contrast is immediately willing to leave, though he does offer Mario his hammer regardless.