Birthday Song (2 Chainz song) was unable to feature Kanye West.
 After its initial release, the film was unavailable for sale or broadcast for many years because of the cost of clearing many copyrights, of which "Happy Birthday to You" was one
 In 1988, Warner/Chappell Music purchased the company owning the copyright for US$25 million, with the value of "Happy Birthday" estimated at US$5 million

