Audio and subtitles are chosen in the player of the service you open. The original soundtrack is always there; the dubs depend on the service and the country.
Spanish dubs
Most big titles carry both the Latin American dub and the Castilian dub from Spain. The español latino guide explains how to pick.
Anime
The anime carries Japanese audio with subtitles and English dubs for the popular series, often a Latin American Spanish dub too.
