Mel talks about Apocalypto and more in this interview from 2014
Starting at 17:15 is Apocalypto; however, the whole interview is good.
http://www.ceskatelevize.cz/porady/1093836883-na-plovarne/6286-episodes-in-english/19200-mel-gibson/
Plus a lot more too; It's very good. He talks about the ending of this film.
"Guys like you don't die on toilets." Mel Gibson-Riggs, Lethal Weapon