This was the first animated film in which any actor's voice is credited. Disney did not give screen credit to any of the actors who voiced the characters in their animated films.
This was the first American animated feature from a studio other than Disney and only the second overall, the first being Snow White and the Seven Dwarfs (1937).
The character of Gulliver was "rotoscoped"--a method devised by the Fleischers where the drawing was achieved by tracing over the movements of a live actor.
Apparently the copyright on this film was not renewed and it thereby fell into public domain. As a result, countless VHS and DVD dealers added it to their inventories, usually offering inferior copies because they do not have access to the original negative or surviving archival prints.
To produce this feature film, the Fleischer studio had to nearly triple in size, from about 200 artists to nearly 700. Max Fleischer had a 32,000-sq.-ft. plant built in Miami (FL) to accommodate the new personnel, as well as to take advantage of that city's tax exemptions on film studios. The fact that unionization had not taken hold in Florida was also a consideration, as there had been a long struggle to organize the Fleischer animators, culminating in a strike in 1937.