1)
Why does the Torah record here that they quarreled with Moshe, and in Pasuk 13 that they quarreled with Hashem?
1.
Seforno: Their quarrel with Moshe was why he brought the congregation of Hashem to this desert, and against Hashem, why He took them out of Egypt.
2.
Refer to 20:13:1.1:1 & 3.
2)
What are the connotations of "ve'Lu Gava'nu bi'Geva Acheinu"?