The process for permission to film from the Cuban side remains somewhat opaque. If the project is not of a political nature, such as a TV commercial or travel show, the process is generally quick and easy.
Internet is available in hotels but connection speeds are still very slow.
Cuba is not an ATA carnet country - local producers deal with all customs clearance including arranging government customs.
Cuba's film location permits can only be obtained through a state-approved production company.