Leaving Mt. Sinai was "suffering" in itself, and it resulted in sin: Shabbat 116a
They Left Mt. Sinai in a rush to abandon Gd, leading to the Complaint for meat: Taanit 29a
Rabbi Yochanan Ben Zakkai said, in jest, "If Moses loved the Jews so much, why did he delay in the desert for 40 years?": Menachot 65a-b
The 12 tribes were forbidden to intermarry: Taanit 30b
The Encampment
How the ram's horn was blown, in gathering the people: Succah 53b
The Levite Camp was considered a Public Area for rules of transport on Shabbat: Shabbat 96b
Why the Jews would look after Moshe when he was returning to his tent: Kiddushin 33b
Rabbah bar bar Chanah declared that he had seen the area where the Jews camped by the Jordan, and it was no larger than three parasangs by three parasangs: Eruvin 55b
Which spot the Jews chose to use for toilet areas, behind them, to the side or in front of them: Eruvin 55b
The clouds surrounding the camp, as a result of Aaron's merit: Taanit 9a