Continuity mistake: After the Colonial assault force parachutes into the Cylon city and Boomer says, "Shouldn't take too much to blow 'em sky high," they race off to the left - and Apollo's sky diving helmet disappears from one shot to the next as they run.
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Continuity mistake: When Baltar sees the Pegasus, it is approaching with her bow toward Baltar's port side. The next exterior shot shows Baltar's ship heading with its bow toward Pegasus' starboard side, as if Baltar's ship reversed, letting Pegasus pass in front, then went forward again and veered sharply right to avoid collision.
Revealing mistake: As Pegasus approaches the two forward base stars, she is shown from the rear of her port side, moving away from camera. The shot is a reversed image of Galactica (her name is backwards on the landing bay). After the vipers clear a path for her, the same shot is flipped again, so that Galactica reads properly, despite the shot purportedly being of Pegasus.
Deliberate mistake: When Starbuck and Apollo attack the 'flank missile launchers' of the two Cylon base stars, the shots of the launchers exploding are actually of the laser cannons on the Galactica (note the red horizontal striping on the "wall" behind each cannon).