When Urki performs a cliff jump into a bail of hay, Assassin's Creed music from viewpoint synchronization can be heard.
There will be English subtitles included because there is not a single line of English spoken in the game.
Far Cry Primal has an Easter egg far in the north. The Easter egg is from Far Cry 3: Blood Dragon (2013).
The game has many nods and easter eggs to former ubisoft games (assassins creed/Farcry3/4/watchdogs2
This is not considered Far Cry 5.