I wouldn't read too much into people being there and filming the takeoff. Having lived in Central America for close to ten years now, in my experience it is very common to see people watching/filming at the end of the runways. In San Jose (C.R.) there are always a few people (and on Sundays many) at the end of the runway watching/filming operations. I have seen the exact same at airports large and small. It seems to be a spectator event even including a bar on the side of the runway at SJO.
In Costa Rica: An Airport Restaurant...On the Runway! - Foodie International
An Iberia A340 passed low overhead on landing at SJO causing a stir in the media with all the videos that came out later. I post this video more as an example to show how many cars are stopped at the end of the runway with people watching.
https://www.youtube.com/watch?v=X5a6rWl6HEs