Changes from the Book
The part of Philippulus the Prophet is significantly reduced. In the TV episode, he is only seen at the beginning of the story when Tintin reaches the observatory and when Tintin is having a nightmare. These appearances were reduced and others, especially Philippulus' "occupation" in the Aurora's crow's nest, are removed entirely. The Aurora's maiden voyage ceremony that happens after Philippulus' departure from the ship in the original book is also removed, and the Aurora's fuel stop in Akureyri, Iceland was likewise left out. Resulting in Captain Chester being absent in this episode. Furthermore, in the episode, the Aurora's crew spot the Peary through binoculars aboard the Aurora, instead of from using a seaplane. The appearance of the mutated spider on the meteorite that attempts to attack Tintin and Snowy during the climax of the story is also much larger and scarier-looking in this episode than it does in the book.
Other more minor changes as seen in the TV episode include the absence of the observatory's doorman, Thompson and Thomson's cameos, Decimus Phostle's assistant suggesting the name for phostlite rather than Phostle ultimately naming it himself, and Tintin's input with him on how the meteorite could be claimed is also significantly shortened.
- Colin O'Meara - Tintin, Aurora Radio Operator
- Susan Roman - Snowy
- David Fox - Captain Haddock
- Peter Meech - Radio Announcer
- When Tintin and Snowy go near the lightpost and slide towards the door archway, Tintin's mouth is light blue.