Final answer:
The final notations in Joshua were likely added by another writer, traditionally suggested to be the prophet Samuel, who is associated with recording early Israelite history.
Step-by-step explanation:
The final notations in the Book of Joshua that references Joshua's death and the elders that outlived him suggest that these passages were added later by another writer. The most commonly suggested author is Samuel, a prophet who is traditionally associated with the recording of Israel's early history and may have edited and compiled these historical texts. This is in line with the Biblical narrative which depicts Samuel as an important figure during the transition period between the judges and the monarchy in Israel's history.