- Big Lipped Alligator Moment: The musical scene with Dirch Mikkelsen (played by Dirch Passer) and a bunch of children.
- Special Effects Failure:
- The green slime that is shot out of the monster's mouth is not only horribly out-of-place, but looks like stop animation when it happens.
- One of Reptilicus' victims turns into a cartoon-like outline as he is devoured.
- The Danish version of the film has shots of Reptilicus flying that were cut out of the American version for looking too ridiculous. Think about that for a second.
- The monster itself can fall under this to several people. On the other hand, it's actually a fairly accurate copy of traditional Norse dragons.