The dimetrodons in the movie were played by rhinoceros iguanas. They grow to about 3-6 feet (1-2 meters) and are kept as pets in many places. In real life, dimetrodons were Synapsid reptiles. They lived in western North America and grew to about 12 feet (4 meters) in size.
Carla Goetabaug:
There's no need to lose that patient voice with me, Professor.
Sir Oliver Lindenbrook:
Would you rather I use an impatient voice?
Carla Goetabaug:
Professor Linderbrook, I am a member of this expedition, and as such I intend to report any observation I make.
Sir Oliver Lindenbrook:
Alec, put it down in the record ...
(at around 1h 45 mins) Near the end of the film, when Hans is calling for his duck, Gertrude, his mouth movements don't match his words.
There's a 35 mm copy on the "Filmoteca Española" in Madrid, Spain with some differences:
English, Swedish, French, Italian, Russian
$3,440,000 (estimated)