Nothing too serious. A professor throws some books at someone who is opposed to his trip to the moon, but this is all done in a comical fashion and is not meant to be taken seriously.
Some aliens appear on the moon that threaten the crew. However, when they are attacked, they hip-toss the aliens, who explode into a cloud of smoke.
When the crew lands on the Man on the Moon, the land in his eye. This causes blood to pour from underneath. It's hard to tell it's blood in the black and white version, though.