2) The Chida says that Asher the son of Yaakov Avinu stays by the entrance to Gehenom and saves those people who learnt Mishnayos. This is why the posuk says מֵאָשֵׁר שְׁמֵנָה לַחְמוֹ the word שמנה has the same exact letters as משנה. (Avodas Hakodesh -Moreh Be'etzba)
3) Someone once saw the Tzvi LaTzadik, the first Bluzhever Rebbe, walking around the room saying Mishnayos "Baal Peh", in the manner of little schoolchildren in those days. The Rebbe sensed that this person found this strange and said to him that when the Malach Hamoves comes for someone they have a terrible pachad (fear), however, one who knows 10 Mishnayos by heart does not have to worry about this pachad. A short time later the Rebbe passed away.