If the Jews hadn't sinned, they would only have needed the Torah and the Book of Joshua, and not the rest of the Prophets and the Writings: Nedarim 22b
Achan
A pile of stones was placed on his coffin: Moed Katan 15a
Elazar lost his position of greatness because he ruled in law before Moshe, even though he worded his statement "Gd told this to my uncle." This is why Joshua is never mentioned as having needed Elazar's help: Eruvin 63a
Elpaal
Which cities he built: Megillah 4a
Joshua
Joshua was an "Ohev Yisrael - person who loved the Jewish people": Eruvin 22b
When Moses was dying, he told Joshua to ask any remaining questions. Joshua responded that, as it is written in the Torah, he had never left Moses' side. Immediately, Joshua forgot 300 laws, and 700 uncertainties developed in his mind. The people wanted to kill Joshua. Gd said to him, "It would not be possible to teach these laws to you; distract the people with war, instead.": Temurah 16a
On the last day of Moses's life, Gd took authority from him and gave it to Yehoshua, so that the two ruled on that day: Sotah 13b
Joshua's encounter with an angel who rebuked him for not bringing the daily afternoon offering, and for not being involved in Torah study, primarily for the latter reason, on the night before the war with Jericho: Eruvin 63b; Megilah 3a-b
One ought not to bow prostrate for prayers of supplication, unless one is assured that he will be answered as Joshua was: Megillah 22b
Hallel-Prayer of Joshua and the Jews while fighting the Canaanite Kings, from Psalms: Pesachim 117a
Joshua didn't have any sons: Pesachim 119b; Megillah 14b
Joshua dying without children because he made a suggestion before Moshe, in dealing with Eldad and Medad: Eruvin 63a-b
Joshua dying without children because he didn't return the Ark to its place in Gilgal on the night before the war with Gilgal, and so the people were not allowed to engage in procreation: Eruvin 63b
His marriage to Rachav: Megillah 14b
Delay of the Jews in Eulogizing Joshua was nearly deadly: Shabbat 105b
30 of Hillel's 80 students were fit to stop the Sun, as Joshua did: Succah 28a
Joshua's enactment, when dividing up Israel, that people should be allowed to graze their animals in others' wild areas [which are not for harvesting], and that they should be allowed to gather branches from others' fields: Eruvin 17a
Rachav
Her conversion, and marriage to Yehoshua: Megillah 14b