What is the significance of the Torah's description of the Manna to coriander seeds and to crystal?
Rashi: The Manna was (pleasantly) round like a coriander seed and sparkled like crystal.
In what way do the current Pesukim constitute a complaint?
Rashi, Targum Onkelos and Targum Yonasan: Although the previous Pasuk presents the people's complaint against the Manna, the current Pesukim come to present Hashem's answer to the complaint
Rashi: To show the world the futility of His children's grumblings. See also Targum Yonasan.
See Na'ar Yonasan.