When the female doctor and the female time traveler view the hologram image of the nude man, the doctor starts to laugh and cover her face a second or two before the image appears.
The captain places a small rocket on the ground and aims it at the bad guys' spaceship. If you watch closely as it takes off, through the smoke, a thin wire can be seen guiding the rocket.
After one of the bad guys kills one of his crewmen, the captain pushes down/tackles the man that shot him. When he does, a distinctive punch sound effect is heard, even though no punch is thrown.