You can't really apply a lot of real logic to a 'Flintstones' movie, but they must at least adhere to their own logic set-up through the story line:
When Fred is taking his 'driver's test' to be a bronto-crane operator, he takes the test on a mechanical, fully-functional simulation of a real living bronto-crane. This makes no sense, for the only reason they use animals for the mechanical devices in their 'world' is because they haven't yet reached an industrial stage in their evolution and don't have the knowledge or skill to build complicated mechanical devices. Yet, they somehow have built a giant mechanical bronto-crane, which is an improvement and advancement over the living version. [Mechanical bronto-cranes are likely to be very expensive to build and maintain, therefore it would make sense to use live bronto-cranes.]
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