Hi,
Shouldn't it be ''at/in the last'' in the following sentence?
The cast of the movie shown by this website displays his name last, despite being a very popular actor today.
No, 'last' is fine. You could say 'at the end'.
However, there are a number of other problems with your sentence.
Say The movie cast-list shown on this website displays his name last / at the end, despite his being a very popular actor today.
Best wishes, Clive