One of my "favorite" comms gaffes was in "Tears of the Sun" with Bruce Willis & Tom Skerritt. They showed Skerritt standing on the flight deck of an aircraft carrier, during flight operations, using a handheld to talk with Willis, who was using a manpack radio. (There were so many "No effing way..." bits about that; it was hard to watch. Especially as a Navy comms tech, who had supported a SEAL Team operating from my carrier.)