Continuity mistake: When Silver Surfer is engulfed by the Fractite, he is standing on the middle of his board with his left foot closest to the front (the "goofy" stance), knees slightly bent and arms extended to his side with his elbows slightly bent. In the next scene, he is shown to have both of his feet pointed towards the front of his board, with his knees bent more and his torso leaning back. The Fractite holds him in place, similar to if you were frozen in ice, so he wouldn't have been able to freely move.
Other mistake: When Gamora is showing the court the footage of the destruction of the planet Vergilia, she says the images were taken from one of the planet's moons. However, much of the footage shown is from the point of view of the planet surface, which is not a view that could be achieved from a moon.
Continuity mistake: When Silver Surfer is heading towards the temple to turn off the Dreamweaver, Beta Ray Bill throws his hammer at his back, which knocks Silver Surfer off his board and into the ground. When Silver Surfer rises out of the hole in the ground, he does so perched upon his board, even though it should be on the ground behind him.
Factual error: When Pip is blasted back by the plasma jump, he is shown to rotate his body and slow down just before Silver Surfer reaches out and grabs him. Since he is in the vacuum of space, no amount of adjusting himself would help him slow down. He would continue to float perpetually until he bumped into something with more mass than himself or entered the atmosphere of a planet.
Other mistake: When the mountain starts to collapse, the Silver Surfer and the enslaved trolls begin falling to the ground below at a rate comparable to what the falling rate on Earth would be. The Surfer is able to catch himself on a ledge and absorb his restraining collar into himself, granting him control over his powers, which he uses to prevent the trolls from falling to their deaths. With the amount of time the Surfer spent struggling to overcome his restraining collar, the trolls would have already fallen to the ground.
Other mistake: When the Navy is attacking the Silver Surfer, the shot of their fighter jets tailing him is suddenly shown to be the newsfeed on a TV. Even if the jets were filming their attack, they wouldn't be live broadcasting it for everyone to see.
Continuity mistake: When the Silver Surfer lands on the platform after Galactus feeds on the planet, he is on the right side (viewer's left) of the platform. After Galactus compliments him on his service, the shot changes and he is suddenly on the opposite side of the platform.