Cosmos had no funding or budget - all equipment was either owned prior to filming or borrowed, all locations were lent and all cast and crew worked on the project without a fee.
Cosmos took 5 years to produce from start to finish.
Excluding the directors, the crew of Cosmos at its busiest point during filming, totaled just three. 85% of the film was shot with the two directors and a crew of just one.
With the exception of scoring the film, directing brothers Elliot & Zander Weaver, took on all major production roles including: screenwriting, prop making, lighting and camerawork, sound recording, editing, sound designing and sound mixing, VFX, poster art and trailers creation.
The folk song, sung by the team during the film is called "Uncle Rat" - performed by Charles Fulton, recorded by S.R. Cowel and is available to listen to for free on the library of congress website.