Explorers on the Moon: Part 1 - S3-E11
Other mistake: Wolff is explaining that if the motor is shut off again, the magnetic sole boots they are wearing will stop them from floating. Whilst he is explaining this, he is placing the boot straps over the Velcro. The first strap he places is only partially on, but a few frames after, a blip occurs in the animation, and the strap is suddenly entirely over the Velcro. The same happens with the second strap as well. (00:08:00)
Explorers on the Moon: Part 1 - S3-E11
Other mistake: Haddock is lowering crates onto the moon and looks over to see Thomson and Thompson, whilst they are heard playing around off-screen. In this shot, Haddock's antenna cannot be seen through his helmet, even though the helmet should be transparent. (00:20:40)
Chosen answer: It is a pill that makes alcohol taste disgusting.