Lacklustre.
'One of Our Dinosaurs Is Missing' has a couple of mildly positive things about it, but it is largely a disappointment. I personally failed to get into the premise, I don't mind silly plots but I just don't feel like it connects at all.
Alongside that, you have some very lazy casting which certainly hasn't aged well whatsoever. You have a number of major characters who are Chinese, yet not a single Chinese actor can be seen - yellowface aplenty. Even taking away the obvious negatives, it's not like it even works in the film's favour either.
Peter Ustinov is completely wasted as Hnup Wan, by making him appear Chinese you lose all of Ustinov's expressions and body language. The guys who play his sidekicks add nothing, so why not just add suitable actors to the roles - Disney had done it before, in fact in the same year with characters in 'The Apple Dumpling Gang' . It's lazy, at best.
As mentioned at the top, there are some pleasant things in there. The score is very good, while the chase scene looks nice - as does the Natural History Museum. Even then, the cat and mouse stuff drags out.
Many issues, even away from the cast. Not one I'd recommend.
