Factual error: Admiral Motti tells General Tagge, "Dangerous to your star fleet, Commander," even though Tagge is an army general and could not command a star fleet.
Suggested correction: It's heartening to see how they adhered to human, earthly military conventions a long time ago in a galaxy far, far away.
Factual error: After the Death Star, when TIE fighters are attacking the Millennium Falcon, each time one explodes at high speed, the debris and the fire does not keep moving.