It’s pretty minor compared to the other stuff posted here, but the character voices often don’t match the characters: i.e., a female co-pilot who sounds like James Earl Jones, or vice-versa. Female passengers often sound like they’re 10 years old, even if they look like they’re 60.
Also, a lot of the English dialog in SAR missions clearly wasn’t written by an English speaker, resulting in such gems as “Let’s keeping on pushing.” “He’s wearing orange hiking gears.” and, as you come in to land “We touch.”