If movie or series have a huge dragon or located in a another world like game of throne or star wars, then conputer effects or C.G.I is the anwer. Ever since the late 1980s, CGI has become an affordable way for movie studio, it’s also not only for making great effect but also for the most arbitrary and minor reasons.
Fear and Loathing in Las Vegas
The character, Tobey Maguire in this film, must be bald. But doing so, his contract required $15.000 to shave his head. So the director, Terry Gilliam, used a bald cap with CGI instead. But it was more expensive for them in the end.
Ghost Rider
Appart from keeping his agent very bust, one of Nicolas Cage’s hobbies is to stay in shape. But unfortunately this 42 year old was not shape enoght for this movie, so the producers used CGI to make his abs bigger in the post-production.
Waterworld
The 1995’s movie, Waterworld, not only have script issues but it also have “water” issue. The water apparently not realistic enough, so the CGI staff added some blue stuff to fill out backdrops and they also improve splashes.
Your Highness
Because the movie is a R-rated movie, but there was a problem regarding Natalie Portman’s derriere is not suitable for young audiences. So they make a digitally shaped thong to solve the problem.
Blood Diamond
At the post-production, the tragic phone-call scene at the end of “Blood Diamon”, they decided that Jennifer Connelly’s expression was not distressed enogh. The CGI staff added some effect to add tears to her face.
All About Film Making 
I thought this was interesting, but I don’t see any sources, either for your text or for your pictures. Since one goal of this blogging project was to approximate a scientific essay, you need to work on citation/sourcing.