There are a lot of visual marks that have to be hit, and lines that need to be said in a right way - so there wasn't really any improvisation on the set when it came to the bulk of the script.
-- Simon Pegg
   
Simon Pegg   Name:
Simon Pegg
Type:
Comedian
Nationality:
British
Birth:
February 14, 1970
https://www.nutquote.com/quote/Simon_Pegg